Greek philosopher who developed an atomistic theory of matter (460-370 BC), first to have the idea of "an atom" being the smallest particle of all matter.
1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
British physicist who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937)
Discovered the neutron in 1932
Created planetary (Bohr) model of the atom
a subatomic particle that has the same mass as a proton but no electric charge
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
negatively charged particle; located outside the atomic nucleus