Átomos,para quem ainda não sabe!
Autor: Eduardo, Leticia, Mariana e Pedro | Publicado: 2011-05-25T14:50:00-07:00

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 <![endif]-->  Na Grécia antiga, Tales de Mileto fez algumas experiências com uma barra de âmbar (resina sólida fossilizada proveniente das árvores). Ele descobriu que, quando atritada com a pele de animal, a barra de âmbar passa a atrair pequenos pedaços de palha.
A matéria é formada de pequenas partículas, os átomos que são formados por partículas, sendo as principais os prótons, os elétrons e os nêutrons. Os prótons e nêutrons são formados por quarks (um dos elementos que constituem a matéria).No núcleo do átomo estão os prótons e os nêutrons, e girando em torno deste núcleo estão os elétrons. Um próton em presença de outro próton se repele, o mesmo ocorre com os elétrons, mas entre um próton e um elétron existe uma força de atração, como no exemplo da barra âmbar e da palha. Desta maneira, atribuímos ao próton e ao elétron uma propriedade física denominada carga elétrica.
Os prótons têm carga elétrica positiva, enquanto os elétrons carga elétrica negativa. Os nêutrons são desprovidos de carga elétrica, pois não apresentam efeitos elétricos. Num átomo, normalmente não existe predominância de cargas elétricas, ou seja, o número de prótons é igual ao número de elétrons. Neste caso dizemos que o átomo é eletricamente neutro.
Numero de massa – é a soma dos prótons e nêutrons do núcleo de um átomo.Numero atômico – número de prótons no núcleo de um átomo

Para Demócrito, a grande variedade de materiais na natureza provinha  dos movimentos dos diferentes tipos de átomos, que, ao se chocarem,  formavam conjuntos maiores, gerando diferentes corpos, com  características próprias. Algumas ideias de Demócrito sobre os átomos:  Agua: formada por átomos ligeiramente esféricos (a água escoa facilmente). 
Terra: formada por átomos cúbicos (a terra é estável e sólida).
Ar: formado por átomos em movimento turbilhonantes (o ar se movimenta - ventos).
Fogo: formado por átomos pontiagudos (o fogo fere).
Alma: formada pelos átomos mais lisos, mais delicados e mais ativos que existem.
Respiração: era considerada troca de átomos, em que átomos novos substituem átomos usados.
Sono: desprendimento de pequeno número de átomos do corpo.
Coma: desprendimento de médio número de átomos do corpo.
 Morte: desprendimento de todos os átomos do corpo e da alma.
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; É importante ter em mente que, átomo, é uma entidade elementar. O  conjunto de átomos que apresentam o mesmo número atômico (Z) é chamado  de elemento químico. Desta forma, na Tabela Periódica dos Elementos, a idéia de entidade elementar é substituída pela idéia de "conjunto".É possível ter aproximadamente 10 sextilhões de átomos em uma casa (o algarismo 1 e 22 zeros à direita)
 Ex.: Ao procurar pelo Carbono na Tabela Periódica, você deve saber que está procurando pelo Elemento Carbono e não pelo átomo de Carbono.
Fontes:&nbsp;&nbsp;http://pt.wikipedia.org/wiki/%C3%81tomo&nbsp;