Atomic Theories

Democritus 

-called these particles atoms
-in 300 BC said atoms were indivisible particles






















John Dalton 

-each element is composed of extremely small particles called atoms
-identical, but differ from other elements
-neither created or destroyed in any chemical reactions
-always same relative numbers












Lavoisier

-law of conversation of mass














Proust

-if a compound is broken down into its constituents, the producers exist in the same ratio as in the compound
















JJ Thompson

-raisin bun model 
-said, positive, spheres with negative particles embedded in them
-1st atomic theory to have positive (protons) and negative (electrons) changes












Rutherford

-showed that atoms have a positive, dense centre with electrons outside it














Janine R