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O que são átomos e sua importância; A evolução dos modelos atômicos; Partículas subatômicas e suas funções; Número Atômico, Massa e Isótopos; Camadas eletrônicas e reatividade

Átomos e Elementos Químicos

Química

Átomos e Elementos Químicos

Explore a estrutura atômica e a base da matéria.

Sumário

• O que são átomos e sua importância

• A evolução dos modelos atômicos

• Partículas subatômicas e suas funções

• Número Atômico, Massa e Isótopos

• Camadas eletrônicas e reatividade

O Que É um Átomo?

Você já parou para pensar do que tudo é feito? Um átomo é a menor partícula que ainda mantém as propriedades de um elemento químico, como o carbono em um lápis ou o ferro em um prego. Eles são os blocos fundamentais de toda a matéria que nos rodeia, invisíveis a olho nu, mas essenciais.

Átomos: blocos fundamentais da matéria, com núcleo e elétrons.

Por Que Estudar Átomos?

Estudar átomos é fundamental para entender como o universo funciona. Tudo, desde a água que bebemos até as estrelas distantes, é feito de átomos. Compreender sua estrutura nos ajuda a explicar fenômenos diários e avançar na tecnologia, como na criação de novos materiais.

Átomos: blocos de construção do universo, essenciais para a ciência.

As Primeiras Ideias

• Demócrito (séc. V a.C.): matéria feita de átomos indivisíveis.

• Átomos se moviam no vazio, formando tudo o que existe.

• Aristóteles (séc. IV a.C.): matéria contínua, não átomos.

• Defendia 4 elementos: terra, água, ar, fogo e éter.

Modelo Atômico de Dalton

Em 1803, John Dalton propôs que o átomo era uma esfera maciça, indivisível e indestrutível, semelhante a uma bola de bilhar. Seu modelo explicou a conservação da massa nas reações químicas e que átomos de um mesmo elemento são idênticos. Isso foi crucial para o avanço da química no século XIX, fornecendo uma base científica.

Dalton: átomo como esfera maciça, indivisível e indestrutível.

Modelo Atômico de Thomson

Em 1897, J.J. Thomson propôs o modelo do 'pudim de passas', onde o átomo era uma esfera positiva com elétrons negativos incrustados, como as passas no bolo. Ele descobriu o elétron, a primeira partícula subatômica. Assim, o átomo não era indivisível como se pensava.

Modelo do pudim de passas: átomo com elétrons incrustados em carga positiva.

Modelo Atômico de Rutherford

Ernest Rutherford realizou o famoso experimento da folha de ouro em 1911, bombardeando-a com partículas alfa. A maioria atravessou, mas algumas foram desviadas, indicando um núcleo pequeno e denso. Ele propôs um modelo planetário, com elétrons girando em torno de um núcleo positivo, como planetas ao redor do sol.

Partículas alfa: Rutherford e o núcleo atômico.

Modelo de Bohr: elétrons orbitam núcleo, como planetas.

Modelo Atômico de Bohr

Niels Bohr, em 1913, propôs que os elétrons orbitam o núcleo em níveis de energia específicos e quantizados. Eles podem saltar entre essas órbitas, absorvendo ou emitindo energia em pacotes, o que explica o espectro de emissão atômica. Um exemplo é o espectro de luz visível produzido pelo hidrogênio, com suas linhas coloridas características.

Modelo de Bohr: elétrons em órbitas quantizadas emitem fótons.

Partículas Subatômicas

• Prótons: Localizados no núcleo, carga elétrica positiva.

• Nêutrons: Também no núcleo, sem carga elétrica (neutros).

• Elétrons: Orbitam o núcleo (eletrosfera), carga negativa.

• O número de prótons define o elemento químico.

Átomos e Elementos Químicos

O que são átomos e sua importância; A evolução dos modelos atômicos; Partículas subatômicas e suas funções; Número Atômico, Massa e Isótopos; Camadas eletrônicas e reatividade

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