{"id":86982,"date":"2023-01-29T07:00:00","date_gmt":"2023-01-29T10:00:00","guid":{"rendered":"https:\/\/vestibulares.estrategia.com\/portal\/?p=86982"},"modified":"2024-04-03T13:40:29","modified_gmt":"2024-04-03T16:40:29","slug":"numero-de-oxidacao","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/","title":{"rendered":"N\u00famero de oxida\u00e7\u00e3o (nox): o que \u00e9, como calcular, tabelas"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-7e4f1408-cefe-4c54-99b0-169c9670dd62\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">Nox<\/span> &eacute; uma abrevia&ccedil;&atilde;o padr&atilde;o para o <span id=\"urn:enhancement-b00c2b70-995f-4b92-b35e-e5570b8e1e44\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> de um elemento qu&iacute;mico. Diz respeito a quantidade de carga el&eacute;trica que os &aacute;tomos daquela esp&eacute;cie podem admitir quando est&atilde;o dispostas em <span id=\"urn:enhancement-2d128553-3b51-4803-a545-59caadbd11f1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ionicas\">liga&ccedil;&otilde;es i&ocirc;nicas<\/span>.&nbsp;<p class=\"wp-block-paragraph\">Conhecer esse valor &eacute; importante tanto para compreender as conex&otilde;es <span id=\"urn:enhancement-e564338a-ebbf-44fe-8a40-632d0c9562a7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ionicas\">i&ocirc;nicas<\/span>, como entender as <span id=\"urn:enhancement-91b25f8b-2d47-44ac-9638-d2a3c49a8b7f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reacoes-de-oxirreducao\">rea&ccedil;&otilde;es de oxirredu&ccedil;&atilde;o<\/span>, que muitas vezes precisam ser balanceadas a partir do <span id=\"urn:enhancement-8c38820c-d183-4a69-9092-2edb68f42c32\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span>. Saiba mais sobre os conceitos e valores em <span id=\"urn:enhancement-eca40dfb-b85c-43b4-99db-20b131979e6a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> ao ler este artigo. Vamos l&aacute;?<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/#Conceito-de-numero-de-oxidacao\" >Conceito de n&uacute;mero de oxida&ccedil;&atilde;o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/#Valores-de-nox\" >Valores de nox<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/#Como-calcular-o-nox\" >Como calcular o nox?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/#Questoes-sobre-nox-no-vestibular\" >Quest&otilde;es sobre nox no vestibular<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/numero-de-oxidacao\/#Estude-com-o-Estrategia-Vestibulares\" >Estude com o Estrat&eacute;gia Vestibulares!<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-conceito-de-numero-de-oxidacao\"><span class=\"ez-toc-section\" id=\"Conceito-de-numero-de-oxidacao\"><\/span>Conceito de n&uacute;mero de oxida&ccedil;&atilde;o<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Al&eacute;m de representar a carga el&eacute;trica admitida quando o elemento est&aacute; em <span id=\"urn:enhancement-bbc01d7a-afbc-4a83-9718-68d6da588378\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ionicas\">liga&ccedil;&atilde;o i&ocirc;nica<\/span>, o <span id=\"urn:enhancement-97b5e7f0-4c03-4508-a347-5830e7cdd51f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> tamb&eacute;m &eacute; a mudan&ccedil;a el&eacute;trica parcial que pode ser observada nos casos em que o <span id=\"urn:enhancement-1045c16c-70f1-452b-b4f2-67eeeed0a145\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> faz liga&ccedil;&atilde;o covalente.&nbsp;<\/p><p class=\"wp-block-paragraph\">Afinal, mesmo no compartilhamento eletr&ocirc;nico, h&aacute; uma diferen&ccedil;a entre qual estrutura at&ocirc;mica atrai mais ou menos os el&eacute;trons. Pode ser, por exemplo, que a <span id=\"urn:enhancement-e835794c-5059-4edb-830a-e3900fa052c9\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nuvem-eletronica\">nuvem eletr&ocirc;nica<\/span> fique mais pr&oacute;xima ao <span id=\"urn:enhancement-45095484-2238-428b-9948-a1c685cd6c05\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> mais eletronegativo, tornando o <span id=\"urn:enhancement-d610c3a6-df23-4722-8fc4-b0a3e2e7d8ae\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> negativo, ao mesmo tempo que o outro <span id=\"urn:enhancement-463f9e41-3e7d-4f93-b88d-287d8d8c875d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> que compartilha fica com <span id=\"urn:enhancement-c653a4bb-3ca3-4f25-aeec-ab895b9a6317\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> mais positivo.<\/p><p class=\"wp-block-paragraph\">De toda forma, afinal, o <span id=\"urn:enhancement-249f7173-d062-4fc7-a2fe-69eb8c3bec30\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> representa a quantidade de el&eacute;trons que um <span id=\"urn:enhancement-3a478637-0724-4d2b-80ea-2624d8bd9bb3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> perdeu ou ganhou de sua <span id=\"urn:enhancement-5f3c82d8-0470-4e1e-96da-2c8336201476\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/camada-de-valencia\">camada de val&ecirc;ncia<\/span>. Nessa mat&eacute;ria da qu&iacute;mica, esses processos podem ser chamados de <span id=\"urn:enhancement-baec8aaa-3c7b-498c-ba73-dc48f0b1d5bc\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/oxirreducao\">oxida&ccedil;&atilde;o<\/span> ou <span id=\"urn:enhancement-bd6d8645-3330-46d8-a1d1-5beeca14da18\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reducao\">redu&ccedil;&atilde;o<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-c4fe4762-dcbe-4f1f-bd89-1eca4e8fc1ba\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reducao\">redu&ccedil;&atilde;o<\/span> acontece quando o elemento est&aacute; ganhando el&eacute;trons. Para memorizar, pense que essas part&iacute;culas subat&ocirc;micas possuem carga negativa e est&atilde;o &ldquo;reduzindo&rdquo;. Nesse caso, o <span id=\"urn:enhancement-7657c890-415c-4138-9e74-3a5330ce3815\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> do elemento est&aacute; diminuindo: se ele tem 3 el&eacute;trons faltando em sua &oacute;rbita (carga positiva = +3), com a <span id=\"urn:enhancement-cede2791-8318-44aa-a509-b9d7647d7a52\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reducao\">redu&ccedil;&atilde;o<\/span> de um el&eacute;tron, estar&atilde;o faltando 2.<\/p><p class=\"wp-block-paragraph\">Ao mesmo tempo, a <span id=\"urn:enhancement-a5d2f89a-d6ac-41de-98f2-0f198880cc41\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/oxirreducao\">oxida&ccedil;&atilde;o<\/span> &eacute; o processo que ocorre quando o <span id=\"urn:enhancement-7c297cb4-edde-4ade-80dc-4e1712de2ec8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> ganha el&eacute;trons do meio. Um elemento que possui 2 el&eacute;trons a mais (carga negativa = -2) em sua <span id=\"urn:enhancement-e816a93f-4892-4254-894b-5753e7928042\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/camada-de-valencia\">camada de val&ecirc;ncia<\/span> pode ser oxidado e ficar com carga el&eacute;trica neutra, quando ganhar 2 el&eacute;trons de outro <span id=\"urn:enhancement-58a0ad77-0fad-43ac-aa26-71187e839bfb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">Dessa forma, ent&atilde;o, toda vez que o n&uacute;mero de <span id=\"urn:enhancement-3812e638-cc3a-4efe-9ac5-35449f6906fb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> aumentar trata-se de uma <span id=\"urn:enhancement-97a1a2bf-bf74-4507-a38b-303958801767\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/oxirreducao\">oxida&ccedil;&atilde;o<\/span> e, quando o <span id=\"urn:enhancement-158b9bbd-781f-479a-8e1a-6fecd86d9137\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> diminui, ocorre uma <span id=\"urn:enhancement-2765c937-21ac-416c-aaab-d6e072b51ff3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/reducao\">redu&ccedil;&atilde;o<\/span>. Como est&aacute; descrito na tabela abaixo.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td>Redu&ccedil;&atilde;o<\/td><td><span id=\"urn:enhancement-7166270c-6741-49e6-9d52-5823ff63dfc7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/oxirreducao\">Oxida&ccedil;&atilde;o<\/span><\/td><\/tr><tr><td><span id=\"urn:enhancement-81dab8a2-261e-43c2-9495-47069d943c73\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">N&uacute;mero de oxida&ccedil;&atilde;o<\/span> diminui<\/td><td><span id=\"urn:enhancement-9c7adccb-803c-47f9-987e-5587a5ef1107\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">N&uacute;mero de oxida&ccedil;&atilde;o<\/span> aumenta<\/td><\/tr><tr><td>Ganho de el&eacute;trons<\/td><td>Perde el&eacute;trons<\/td><\/tr><tr><td>Exemplos-2 &rarr; -3+4 &rarr; +1+ 2 &rarr; 0<\/td><td>Exemplos-2 &rarr; -10 &rarr; +5+2 &rarr; +4<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\" id=\"h-valores-de-nox\"><span class=\"ez-toc-section\" id=\"Valores-de-nox\"><\/span>Valores de nox<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Para calcular o <span id=\"urn:enhancement-cec722e6-a0ff-45e0-866b-926b5737ab34\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> de um <span id=\"urn:enhancement-bef3dcbb-9d60-4a7c-9d36-29a89b8b1ca4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span>, &eacute; importante conhecer algumas regras a respeito desse conceito. Depois de consideradas todas elas, fica mais f&aacute;cil de encontrar o <span id=\"urn:enhancement-d97553c7-a8f5-4a8e-bc01-ea9e5be061c4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> dos elementos que n&atilde;o est&atilde;o listados nas normas. Acompanhe.&nbsp;<\/p><h3 class=\"wp-block-heading\" id=\"h-nox-de-substancias-simples\">Nox de subst&acirc;ncias simples<\/h3><p class=\"wp-block-paragraph\">O <span id=\"urn:enhancement-72542913-0af5-4e95-a3e7-a09cf4eba1e2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> de subst&acirc;ncias simples, ou seja, mol&eacute;culas que possuem &aacute;tomos de um s&oacute; elemento &eacute; sempre igual a zero. Ent&atilde;o, o <span id=\"urn:enhancement-365aae69-9515-46ab-ab7d-72ff3f41998a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> do O<sub>2<\/sub>, N<sub>2<\/sub>, F<sub>2<\/sub>, Na, Fe, Al, H<sub>2<\/sub> &eacute; 0.<\/p><h3 class=\"wp-block-heading\" id=\"h-nox-de-ions-de-um-so-atomo\">Nox de &iacute;ons de um s&oacute; &aacute;tomo<\/h3><p class=\"wp-block-paragraph\">No caso de &iacute;ons, o <span id=\"urn:enhancement-d62c80aa-8cbc-466b-a2d4-35ab7f04b80c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> &eacute; igual a sua carga el&eacute;trica. Isso indica que os &acirc;nions possuem <span id=\"urn:enhancement-2b199ff0-eed7-46c0-a89b-427c7258d173\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> negativo e c&aacute;tions t&ecirc;m <span id=\"urn:enhancement-b56a9c95-eb8d-41ea-8ba1-c2120c883ce4\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> positivos. Ent&atilde;o como exemplo, o <span id=\"urn:enhancement-a774482b-70e9-482f-8b3a-97d99dbaba80\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> de H<sup>+<\/sup> &eacute; +1 e o <span id=\"urn:enhancement-e46fab67-0e20-4873-a31f-5f50aee52bc0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> de F<sup>-1<\/sup> &eacute; -1.&nbsp;<\/p><h3 class=\"wp-block-heading\" id=\"h-nox-de-ions-de-mais-de-um-atomo\">Nox de &iacute;ons de mais de um &aacute;tomo<\/h3><p class=\"wp-block-paragraph\">Quando os &iacute;ons s&atilde;o constitu&iacute;dos pela uni&atilde;o de v&aacute;rios &aacute;tomos, a soma dos <span id=\"urn:enhancement-8383be99-ba45-4761-b3c6-9c80b2865b16\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> dos elementos fornece o <span id=\"urn:enhancement-8d036121-fe97-4988-9d3c-05c83dabfd1c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> daquele &iacute;on. Por exemplo, em SO<sub>4<\/sub><sup>-2 <\/sup>o <span id=\"urn:enhancement-dcca7a65-66b6-4b91-ab05-e053ebff975e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> &eacute; -2 porque:<\/p><ul class=\"wp-block-list\">\n<li>Nox S = +6, nesse composto;<\/li>\n\n\n\n<li>Por tabela, nox O = -2, multiplicado pelo n&uacute;mero de &aacute;tomos &eacute; tal que -2.4=-8;<\/li>\n\n\n\n<li>A soma entre + 6 + (-8) = -2 &rarr; nox do &iacute;on.<\/li>\n<\/ul><h3 class=\"wp-block-heading\" id=\"h-substancias-ionicas-ou-moleculares\">Subst&acirc;ncias i&ocirc;nicas ou moleculares<\/h3><p class=\"wp-block-paragraph\">Se os &aacute;tomos est&atilde;o ligados por conex&otilde;es covalentes ou <span id=\"urn:enhancement-53da57cd-480f-4d99-992f-bcfda937913b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ionicas\">i&ocirc;nicas<\/span> que se equilibram, o <span id=\"urn:enhancement-8de7a3fa-255a-42c8-b2be-e15bf44119ea\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> daquela subst&acirc;ncia ser&aacute; igual a 0. Como &eacute; o caso do NaCl (Na<sup>+<\/sup>Cl<sup>&ndash;<\/sup>).&nbsp;<\/p><h3 class=\"wp-block-heading\" id=\"h-tabela-de-nox-fixo-nbsp\">Tabela de nox fixo&nbsp;<\/h3><p class=\"wp-block-paragraph\">Alguns elementos e fam&iacute;lias possuem o valor de <span id=\"urn:enhancement-1335bafb-9bf1-43bb-8474-4d554804b8b5\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> fixo e &eacute; importante decorar a maior parte deles, o que facilita quando precisar descobrir o <span id=\"urn:enhancement-0ecc0985-8668-416e-a9a0-57ad06a08159\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span> dos &aacute;tomos que variam em <span id=\"urn:enhancement-d483ddcf-12ae-4471-b4ad-6db9aba7e498\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span>.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td>Elementos&nbsp;<\/td><td><span id=\"urn:enhancement-962ce8b1-1bce-40f9-bd5f-91ec01097bd0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">Nox<\/span><\/td><td>Tipo de liga&ccedil;&atilde;o ou situa&ccedil;&atilde;o<\/td><td>Exemplo<\/td><\/tr><tr><td>Metais alcalinos (IA)Li, Na, K, Rb, Cs e Fr<\/td><td>+1<\/td><td>Subst&acirc;ncias compostas<\/td><td>NaClKOH<\/td><\/tr><tr><td>Metais alcalinos terrosos (IIA)Be, Mg, Ca, Sr, Ba e Ra<\/td><td>+2<\/td><td>Subst&acirc;ncias compostas<\/td><td>Ca(OH)<sub>2<\/sub>MgCl<sub>2<\/sub><\/td><\/tr><tr><td>Prata (Ag)<\/td><td>+1<\/td><td>Subst&acirc;ncias compostas<\/td><td>AgOH<\/td><\/tr><tr><td>Zinco (Zn)<\/td><td>+2<\/td><td>Subst&acirc;ncias compostas<\/td><td>ZnCl<sub>2<\/sub><\/td><\/tr><tr><td>Alum&iacute;nio (Al)<\/td><td>+3<\/td><td>Subst&acirc;ncias compostas<\/td><td>Al(OH)<sub>3<\/sub><\/td><\/tr><tr><td>Enxofre (S)<\/td><td>-2<\/td><td>Subst&acirc;ncias em que o enxofre &eacute; o elemento mais eletronegativo<\/td><td>Au<sub>2<\/sub>S<\/td><\/tr><tr><td>Halog&ecirc;nios (F, Cl, Br e I)<\/td><td>-1<\/td><td>Subst&acirc;ncias compostas em que o enxofre &eacute; o halog&ecirc;nio mais eletronegativo<\/td><td>NaClHFHI<\/td><\/tr><tr><td>Oxig&ecirc;nio (O)<\/td><td>-2<\/td><td>Na maior parte das subst&acirc;ncias compostas<\/td><td>H<sub>2<\/sub>O<\/td><\/tr><tr><td>Oxig&ecirc;nio (O)<\/td><td>-1<\/td><td>Em per&oacute;xidos<\/td><td>H<sub>2<\/sub>O<sub>2<\/sub><\/td><\/tr><tr><td>Oxig&ecirc;nio (O)<\/td><td>-1\/2<\/td><td>Em super&oacute;xidos<\/td><td>BaO<sub>4<\/sub><\/td><\/tr><tr><td>Oxig&ecirc;nio (O)<\/td><td>+2 ou +1<\/td><td>Em fluoretos&nbsp;<\/td><td>OF<sub>2 <\/sub>&nbsp;<br>O<sub>2<\/sub>F<sub>2<\/sub><\/td><\/tr><tr><td>Hidrog&ecirc;nio (H)<\/td><td>+1&nbsp;<\/td><td>Ligado a ametais (&aacute;tomos mais eletronegativos que o H)<\/td><td>HF<\/td><\/tr><tr><td>Hidrog&ecirc;nio (H)<\/td><td>-1<\/td><td>Ligado a metais (&aacute;tomos mais eletronegativos que ele)<\/td><td>NaH<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\" id=\"h-como-calcular-o-nox\"><span class=\"ez-toc-section\" id=\"Como-calcular-o-nox\"><\/span>Como calcular o nox?<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Para encontrar o <span id=\"urn:enhancement-e74854cd-a454-452c-a097-692edf290031\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> de um <span id=\"urn:enhancement-0c16eb08-6ea1-4002-a85f-286e205d9072\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> em uma mol&eacute;cula qualquer, &eacute; importante levar em considera&ccedil;&atilde;o as regras acima apresentadas. Assim, se o elemento tiver um valor de <span id=\"urn:enhancement-6cc97b74-420c-4f99-97cd-4b37d383b6fb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> vari&aacute;vel ou desconhecido por voc&ecirc;, &eacute; poss&iacute;vel fazer c&aacute;lculos (somas e multiplica&ccedil;&otilde;es) e encontrar esse <span id=\"urn:enhancement-190d66ca-1156-48d8-9022-b1d658f23952\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">n&uacute;mero de oxida&ccedil;&atilde;o<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">Lembre-se sempre que, em uma subst&acirc;ncia composta, o valor do <span id=\"urn:enhancement-47df0e0b-291a-4d91-87bb-b5e814d47525\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> &eacute; multiplicado pelo n&uacute;mero de &aacute;tomos do elemento. Observe como ser&aacute; calculado o <span id=\"urn:enhancement-ca905d0d-eaec-41f9-adb8-11ec0cc5d002\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> do enxofre na mol&eacute;cula de &aacute;cido sulf&uacute;rico (H<sub>2<\/sub>SO<sub>4<\/sub>).<\/p><p class=\"wp-block-paragraph\">H<sub>2<\/sub>SO<sub>4<\/sub><\/p><p class=\"wp-block-paragraph\">Perceba que a f&oacute;rmula n&atilde;o apresenta um &iacute;on, mas uma subst&acirc;ncia est&aacute;vel de carga total igual a zero. Ent&atilde;o, a soma entre os <span id=\"urn:enhancement-6b1c834f-8419-4ce0-96d8-bf8099ccc1be\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> dos 7 &aacute;tomos deve ser igual a 0.&nbsp;<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-8a533bd0-7362-496d-9003-310e77e0cc0b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> H * 2&nbsp; + <span id=\"urn:enhancement-d4309499-c828-45cf-be16-2feb3f1f4a76\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S + <span id=\"urn:enhancement-9e49ef9e-37ac-492c-8ef7-5b8e196b765e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> O * 4 = 0<\/p><p class=\"wp-block-paragraph\">Por conven&ccedil;&atilde;o, &eacute; adotado que o <span id=\"urn:enhancement-e7fa3242-5bca-4fdb-b1c8-f73cb34a5df6\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> do oxig&ecirc;nio &eacute; igual a -2 na maior parte das subst&acirc;ncias compostas. Assim como o <span id=\"urn:enhancement-f3713c21-351b-4c98-8c9f-1ba04037079d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/atomo\">&aacute;tomo<\/span> de hidrog&ecirc;nio tem <span id=\"urn:enhancement-8200fbc5-4130-462d-aef6-d32486c8c8db\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> +1 quando est&aacute; ligado a compostos menos eletronegativos do que ele. Com esses valores, vamos realizar os c&aacute;lculos:<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-75221601-1ad2-44f1-b2fc-52e6e13cb144\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> H * 2&nbsp; + <span id=\"urn:enhancement-28a770ae-2129-488a-8cfc-a5f71f80846d\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S + <span id=\"urn:enhancement-57f3b319-d0d5-405f-8c81-7eea5fbf4baf\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> O * 4 = 0<\/p><p class=\"wp-block-paragraph\">1 * 2&nbsp; + <span id=\"urn:enhancement-1be49216-7e41-46ff-8d2f-b3132c130176\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S + -2 * 4 = 0<\/p><p class=\"wp-block-paragraph\">2 + <span id=\"urn:enhancement-5e4e771e-fe2f-47dc-b8e9-54564f5c6465\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S &ndash; 8 = 0&nbsp;<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-0b835566-b206-49d6-b552-6bb8ceffb0c0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S &ndash; 6 = 0<\/p><p class=\"wp-block-paragraph\"><span id=\"urn:enhancement-59741383-a196-4a32-b2d7-ba06e16e9f83\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/nox\">nox<\/span> S = 6<\/p><p class=\"wp-block-paragraph\">+ Veja tamb&eacute;m: <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/oxirreducao\/\" target=\"_blank\">Oxirredu&ccedil;&atilde;o: troca de el&eacute;trons e balanceamento<\/a><br><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/quimica\/eletroquimica-no-enem\/\" target=\"_blank\">O que cai sobre Eletroqu&iacute;mica no Enem?<\/a><\/p><h2 class=\"wp-block-heading\" id=\"h-questoes-sobre-nox-no-vestibular\"><span class=\"ez-toc-section\" id=\"Questoes-sobre-nox-no-vestibular\"><\/span>Quest&otilde;es sobre nox no vestibular<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">(Puccamp&ndash;SP) Descobertas recentes da Medicina indicam a efici&ecirc;ncia do &oacute;xido n&iacute;trico (NO) no tratamento de determinado tipo de pneumonia. Sendo facilmente oxidado pelo oxig&ecirc;nio e NO2, quando preparado em laborat&oacute;rio, o &aacute;cido n&iacute;trico deve ser recolhido em meio que n&atilde;o contenha O2. Os n&uacute;meros de <span id=\"urn:enhancement-8837ae7d-8609-4969-891f-e0ecfac9b9e0\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/oxirreducao\">oxida&ccedil;&atilde;o<\/span> do nitrog&ecirc;nio no NO e NO2 s&atilde;o, respectivamente:<\/p><p class=\"wp-block-paragraph\">a) +3 e +6.<br><strong>b) +2 e +4<\/strong><br>c) +2 e +2.<br>d) Zero e +4.<br>e) Zero e +2.<\/p><h2 class=\"wp-block-heading\" id=\"h-estude-com-o-estrategia-vestibulares\"><span class=\"ez-toc-section\" id=\"Estude-com-o-Estrategia-Vestibulares\"><\/span>Estude com o Estrat&eacute;gia Vestibulares!<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">A Coruja facilita seus estudos do come&ccedil;o ao fim. Aqui voc&ecirc; encontra todo o conte&uacute;do did&aacute;tico para a prepara&ccedil;&atilde;o do vestibular, pode tirar suas d&uacute;vidas em f&oacute;runs online, encontrar dicas a respeito da prova no nosso <a href=\"https:\/\/www.youtube.com\/@EstrategiaVestibulares\" target=\"_blank\" rel=\"noopener noreferrer\">canal do YouTube<\/a> e ainda tem acesso aos assuntos da prova em v&iacute;deos e &aacute;udios gravados. Clique no banner e saiba mais!<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/cursos\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/12\/EV1.jpg\" alt=\"CTA - Estrat\u00e9gia Vestibulares 1\" title=\"CTA - Estrat\u00e9gia Vestibulares 1\">\n        <\/a>\n\n\n\n\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"Nox &eacute; uma abrevia&ccedil;&atilde;o padr&atilde;o para o n&uacute;mero de oxida&ccedil;&atilde;o de um elemento qu&iacute;mico. Diz respeito a quantidade&hellip;\n","protected":false},"author":23,"featured_media":86968,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-86982","post","type-post","status-publish","format-standard","has-post-thumbnail","category-quimica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>N\u00famero de oxida\u00e7\u00e3o (nox): o que \u00e9, como calcular, tabelas<\/title>\n<meta name=\"description\" content=\"Nox \u00e9 o n\u00famero de oxida\u00e7\u00e3o de um elemento qu\u00edmico. Ele est\u00e1 relacionado com o balanceamento de rea\u00e7\u00f5es e liga\u00e7\u00f5es qu\u00edmicas. 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