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class="post-503 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-atomicos tag-atomos tag-eletrons tag-energia tag-esfera tag-orbita tag-particulas">

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Química- Estrutura Atômica

Química

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I. Os primeiros Modelos Atômicos 1. O átomo de Dalton: Segundo Dalton, todo material é constituído por um aglomerado de átomos. Para ele, cada átomo seria uma minúscula partícula esférica, maciça e indivisível. 2. Modelo de Rutherford-Bohr: Com o passar do tempo, o átomo de Dalton começou a se tornar falho para explicar uma série de fenômenos que la se observando. Como poderíamos por exemplo, explicar a eletricidade, omagnetismo, etc…? Assim, ficou provado que os átomos de polônio são capazes de emitir partículas de carga positiva, através de radioatividade. Essas partículas positivas foram denominadas ”partículas alfa ( a ). Logo, se estas partículas foram emitidas por um átomo chegou-se a conclusão que o átomo é DIVISÍVEL. Para que…

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Explicações, Química, Resumos
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class="post-498 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-atomos tag-compostas tag-hidrogenio tag-liquido tag-materias tag-oxigenio tag-particulas tag-simples tag-substancias">

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Substâncias Simples e Compostas

Química

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Qualquer tipo de matéria é sempre formada por partículas minúsculas chamadas átomos. Atualmente são conhecidos 111 tipos de átomos, quimicamente diferentes. Cada um desse tipo representa um elemento químico, o qual recebe um nome e uma abreviação chamada símbolo. Exemplo: Elemento: Hidrogênio símbolo: H Carbono símbolo: C Esses tipos de átomos diferentes podem se agrupar das mais variadas maneiras possíveis formando uma infinidade de moléculas diferentes. Cada molécula passa então a representar um substância pura ou espéciequímica. Cada substância é representada por uma abreviação denominada fórmula. Assim: H² = Gás Hidrogênio I. Substâncias Simples: As substâncias simples são moléculas formadas por átomos de um mesmo elemento químico. exemplo: Devemos observar porém que há átomos…

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Explicações, Química, Resumos
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class="post-251 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-atomos tag-fenomeno tag-isobaro tag-isotonos tag-isotopos tag-massa tag-numero-atomico tag-quimica-2">

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Isótopos, Isóbaros, Isótonos – Química

Química

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Todos os átomos de um mesmo elemento são iguais? Quimicamente são, pois as propriedades químicas dependem do número de prótons e elétrons. Porém, como o número de nêutrons é variável, um mesmo elemento pode ter átomos com números de massa diferentes. Esse fenômeno é chamado isotopia. Isótopos– São átomos de mesmo número atômico e números de massa diferentes. Observe estes três isótopos: 1H1 -> 1 próton, 0 nêutron, e 1 elétron = Hidrogênio leve 1H2 -> 1 próton, 1 nêutron, e 1 elétron = deutério (hidrogênio pesado) 1H3 -> 1…

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Explicações, Química, Resumos
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class="post-84 post type-post status-publish format-standard hentry category-explicacoes category-quimica category-resumos tag-atomos tag-ebulicao tag-elementos-quimicos tag-eletroafinidade tag-eletrons tag-energia tag-ionizacao tag-numeros-atomicos tag-quimica-2 tag-tabela-periodica">

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A Tabela Periódica


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A tabela periódica surgiu pra juntar os grupos de elementos que tem propriedades químicas e físicas parecidas, portanto, ela organiza os grupos: Metais, semimetais, não metais, e gases nobres. Em grupos separados para facilitar sua localização. veja: Metais: Eles são a maioria dos elementos da tabela. São bons condutores de eletricidade e calor, maleáveis e dúcteis, tem brilho metálico característico e são sólidos, com exceção do mercúrio. Não-Metais: ao contrário dos metais, não são bons condutores de calor e eletricidade, não são maleáveis e dúcteis e não possuem brilho como…

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Explicações, Química, Resumos
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