Matter Contributors

Schrodinger
Electrons in clouds – mathematical model of atom
Mendeleev
First periodic table – arranged by mass
Heisenberg
uncertainty principle
Chadwick
Discovered neutron
Rutherford
Gold foil experiment – discovered nucleus
Millikan
Exact charge of an electron
Planck
Quantum nature of energy
de Broglie
Particle and wave duality
Bohr
Planetary model of atom
Democritus
Proposed idea of atoms in 4th century B.C.
E. Goldstein
Discovered proton
J.J. Thomson
Discovered electron – plum pudding model
Dalton
atomic theory
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