Atoms and Molecules ( Science )

Atoms and Molecules


Matter was believed to be made of

> According by ancient Greek philosopher

  • Fire
  • Earth
  • Air
  • Water

> According by ancient Chinese philosopher

  • Gold
  • Wood
  • Water
  • Fire
  • Earth


Democritus         -> Believed that if you divide anything for long enough, there would come or time when you would reach a single indivisible particle

Atom                     -> Comes from the Greek word atoms peoning indivisible and defined as the smallest particle or element.


Dalton’s model of atom

  • Elements are composed of very small hard particle called atoms that cannot be divided into smaller particles
  • Atoms of the same elements are a like in all the is properties including their atomic masses, and atoms of different elements are different
  • Atoms cannot be crectized destroyed or changed into atoms of and other kind by chemical reaction basic particles of atom





Nucleus                                -> Very small positively changed

Electrons                             -> Negatively charged particles in the atom

Protons                                -> Is a small positively charged particles


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