John Dalton
He discovered that all matter is made up of different particles (atoms)
William crooks
First to think atoms are charged negatively or positively
JJ Thomson
Discovered electrons
JJ Thompson
Made the Plumb pudding theory
Ernest Rutherford
Discovered nucleus.
Ernest Rutherford
He proved Thomson's theory wrong
Niels Bohr
Therorized electrons have a fixed orbit nucleus
James Chadwick
He proved neutrons exist in atoms
Chadwick
put neutron in nucleus
Rutherford
discovered the proton
Aston
discovered isotopes
Rutherford
said that the number of electrons is equal to the number of protons
Dalton
Who said atoms are indivisible and indestructible
Thomson
said atoms are a positively charged sphere
Rutherford
identified the nucleus
crookes
identified a stream of something, yet couldn't identify what the stream was
Dalton
Who said atoms of the same element are identical
Dalton
Who said atoms don't change during chemical reactions
Thomson
Who said electrons are inside the sphere
Dalton
Who said atoms of different elements are different
Rutherford
Who moved the electrons outside the center