Periodic Table History Flashcards
1
Q
What did ancient Greeks believe?
A
Matter was made of earth air Fire and Water
Later believed that matter couldn’t be made of small circles
2
Q
What did John dalton say? (2)
A
Atoms can’t be broken down
Atoms of an element are identical
Atoms of différent elements can form compounds
Atoms rearrange in reactions
3
Q
What did Thomson discover?
A
The discovery of electrons (plum pudding)
4
Q
What did Rutherford discover?
A
Atoms have a central positif nucleus
Most of the mass is found in the middle
5
Q
What did Bohr discover?
A
Electron move in shells around nucleus so that electrons don’t just get attracted to positive nucleus
