Thomson (year)
1897
Chadwick (year)
1932
Rutherford (year)
1909
Bohr (year)
1913
Dalton (year)
1805
Democritus (year)
400 bc
1897
Thomson
1932
Chadwick
1909
Rutherford
1913
Bohr
1805
Dalton
Thomson (discovery)
Electron
Chadwick (discovery)
Neutron
Rutherford (discovery)
Nucleus
Bohr (discovery)
Electron shells
Dalton (discovery)
Atom
Electron (person)
Thomson
Neutron (person)
Chadwick
Nucleus (person)
Rutherford
Electron shells (person)
Bohr
Atom (person)
Dalton
Electron (year)
1897
Neutron (year)
1932
Nucleus (year)
1909