{"id":30329,"date":"2016-05-19T13:52:23","date_gmt":"2016-05-19T13:52:23","guid":{"rendered":"http:\/\/cms.portalsaofrancisco.com.br\/?p=30329"},"modified":"2016-05-19T14:33:16","modified_gmt":"2016-05-19T14:33:16","slug":"protactinio","status":"publish","type":"post","link":"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/ciencias-da-natureza\/quimica\/protactinio","title":{"rendered":"Protact\u00ednio"},"content":{"rendered":"<h4>Hist\u00f3ria<\/h4>\n<p>Mendeleev disse que deveria haver um elemento entre t\u00f3rio e ur\u00e2nio, mas evitou      detec\u00e7\u00e3o.<\/p>\n<p>Ent\u00e3o, em 1900, William Crookes separou um material altamente radioativos      de ur\u00e2nio, mas n\u00e3o conseguiu identific\u00e1-lo.<\/p>\n<p>Em 1913, Kasimir Fajans e Otto G\u00f6hring mostraram que este novo elemento deteriorado      pela emiss\u00e3o-beta e existia apenas fugazmente.<\/p>\n<p>N\u00f3s agora sabemos que \u00e9 um membro da seq\u00fc\u00eancia de elementos atrav\u00e9s do qual      o ur\u00e2nio decai.<\/p>\n<p>Foi o is\u00f3topo <strong>Protact\u00ednio-234<\/strong>, que tem uma meia-vida de      6 horas 42 minutos.<\/p>\n<p>Um is\u00f3topo de vida mais longa foi separado de uraninita min\u00e9rio de ur\u00e2nio      (\u00f3xido de ur\u00e2nio, U 3 O 8) em 1918 por Lise      Meitner no Instituto Kaiser-Wilhelm, em Berlim.<\/p>\n<p>Esta foi a mais longa dura\u00e7\u00e3o de is\u00f3topos <strong>Protact\u00ednio-231<\/strong>,      tamb\u00e9m vindo de ur\u00e2nio, e sua meia-vida \u00e9 de 32.500 anos.<\/p>\n<p>Em 1934, von Aristid Grosse reduzida de \u00f3xido de metal <strong>Protact\u00ednio      <\/strong>para <strong>Protact\u00ednio<\/strong> pela decomposi\u00e7\u00e3o de sua iodeto      (PAF 5) em um filamento aquecido.<\/p>\n<h4>S\u00edmbolo &#8211; <b>Pa<\/b><\/h4>\n<p>Elemento met\u00e1lico radioativo pertencente \u00e0 s\u00e9rie dos actin\u00eddeos. <\/p>\n<blockquote>\n<p><strong>N\u00famero at\u00f4mico: <\/strong>91<strong><br \/>\n       Configura\u00e7\u00e3o eletr\u00f4nica:<\/strong> [Rn] 5f2 6d1 7s2<strong><br \/>\n       Massa at\u00f4mica:<\/strong> 231,036<strong><br \/>\n       d =<\/strong> 15,37 g.cm-3 (calculada)<strong><br \/>\n       Ponto de fus\u00e3o:<\/strong> 1600,0 \u00b0 C (K 1873,15, 2912,0 \u00b0 F) <br \/>\n<strong>Ponto de ebuli\u00e7\u00e3o:<\/strong> Desconhecido <br \/>\n<strong>N\u00famero de pr\u00f3tons \/ El\u00e9trons:<\/strong> 91 <br \/>\n<strong>N\u00famero de n\u00eautrons:<\/strong> 140 <br \/>\n<strong>Densidade @ 293 K:<\/strong> 15,4 g \/ cm 3<br \/>\n<strong>Cor:<\/strong> Desconhecido.<strong><br \/>\n       Data da descoberta:<\/strong> 1917 <br \/>\n<strong>Descobridor:<\/strong> Fredrich Soddy <br \/>\n<strong>Nome de Origem:<\/strong> A partir dos <i>protos<\/i> palavra grega        (primeiro) <br \/>\n<strong>Usos:<\/strong> N\u00e3o utiliza\u00e7\u00f5es conhecidas <br \/>\n<strong>Obtido a partir de:<\/strong> produtos de fiss\u00e3o do ur\u00e2nio, t\u00f3rio,        plut\u00f4nio.<\/p>\n<\/blockquote>\n<p>O is\u00f3topo mais est\u00e1vel \u00e9 231Pa que tem meia vida de 3,43 x 104      anos. <\/p>\n<p>Pelo menos 10 outros radiois\u00f3topos s\u00e3o conhecidos. <\/p>\n<p>O 231Pa ocorre em todos os min\u00e9rios de ur\u00e2nio pois \u00e9 derivado      de 235U. <\/p>\n<p>O <strong>protact\u00ednio <\/strong>n\u00e3o tem aplica\u00e7\u00f5es pr\u00e1ticas. <\/p>\n<p>Foi descoberto por Lise Meitner e Otto Hahn em 1917.<\/p>\n<h4>Estrutura at\u00f4mica<\/h4>\n<p class=\"imagem\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2016\/05\/protactinio-2.jpg\" width=\"379\" height=\"373\" alt=\"Protact\u00ednio\" title=\"Protact\u00ednio\" \/><\/p>\n<p><strong>N\u00famero de n\u00edveis de energia: <\/strong>7 <\/p>\n<blockquote>\n<p><strong>Primeiro N\u00edvel de energia:<\/strong> 2 <br \/>\n<strong>Segundo N\u00edvel de Energia: <\/strong>8 <br \/>\n<strong>Terceiro N\u00edvel de Energia: <\/strong>18 <br \/>\n<strong>Quarto N\u00edvel de energia:<\/strong> 32 <br \/>\n<strong>Quinto N\u00edvel de energia:<\/strong> 20 <br \/>\n<strong>Sexta n\u00edvel de energia: <\/strong>9 <br \/>\n<strong>S\u00e9timo N\u00edvel de energia:<\/strong> 2 <\/p>\n<\/blockquote>\n<h4>Usos<\/h4>\n<p><strong>Protact\u00ednio<\/strong> \u00e9 pouco utilizado fora da investiga\u00e7\u00e3o. <\/p>\n<h4>Utiliza\u00e7\u00e3o<\/h4>\n<p>Embora o <strong>protact\u00ednio<\/strong> seja supercondutor a temperaturas abaixo      de 1,4K, ele n\u00e3o apresenta nenhuma aplica\u00e7\u00e3o significativa. <\/p>\n<h4>Propriedades f\u00edsicas <\/h4>\n<p><strong>Protact\u00ednio<\/strong> \u00e9 um metal brilhante brilhante.<\/p>\n<p>Quando exposto ao ar, \u00e9 facilmente combina com <b>oxig\u00eanio<\/b> para formar      um revestimento esbranqui\u00e7ada de \u00f3xido de <strong>Protact\u00ednio<\/strong>. <\/p>\n<p>O seu ponto de fus\u00e3o \u00e9 pensado para ser de cerca de 1.560 \u00b0 C (2.840 \u00b0 F)      e a sua densidade de cerca de 15,37 gramas por cent\u00edmetro c\u00fabico.<\/p>\n<h4>Propriedades qu\u00edmicas<\/h4>\n<p><strong>Protact\u00ednio<\/strong> forma compostos com os \u00e1tomos de halog\u00eanio <b>(fl\u00faor,      cloro, bromo,<\/b> e <b>iodo)<\/b> e com hidrog\u00eanio.<\/p>\n<p>Mas estes compostos n\u00e3o t\u00eam sido estudados em detalhe.<\/p>\n<p>Fonte:  www.rsc.org\/www.cdcc.sc.usp.br\/www.chemicalelements.com\/www.chemistryexplained.com<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Protact\u00ednio, Elemento, Qu\u00edmico, S\u00edmbolo, Uso, Utiliza\u00e7\u00e3o, Metal, Propriedade, Estrutura, N\u00famero, N\u00edvel, Aplica\u00e7\u00f5es, Hist\u00f3ria, Protact\u00ednio<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[82],"tags":[],"class_list":["post-30329","post","type-post","status-publish","format-standard","hentry","category-quimica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Protact\u00ednio, Elemento, Qu\u00edmico, S\u00edmbolo, Uso Protact\u00ednio<\/title>\n<meta name=\"description\" content=\"Protact\u00ednio, Elemento, Qu\u00edmico, S\u00edmbolo, Uso, Utiliza\u00e7\u00e3o, Metal, Propriedade, Estrutura, N\u00famero, N\u00edvel, Aplica\u00e7\u00f5es, Hist\u00f3ria, Protact\u00ednio\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta 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