The Magic Number is 39!
1 and 14 didn't go in squares.
Democritus: 2
Dalton: 7
Thomas: 18
Chadwick: 12
Rutherford: 8
Proton: 5
Atom: 11
Bohr: 15
Wave Model: 13
Neutron: 17
Nucleus: 6
Alpha Particle: 3
Electron: 16
Model: 10
Energy Levels: 4
Electron Cloud: 9