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400
Democritus
Democritus came up with his own atomic theory. He found out that all matter consists of invisible particles called atom, and that atoms are indestructible. -
Period: 400 to
Atomic Discoveries
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John Dalton
John Dalton discovered how to combine two different atoms and make a new one. -
Ernest Rutherford
Was the very first to discover and tell the world about the electron. -
J.J. Thompson
Suggested than an atom was a positive sphere with electrons all around it. -
Robert Millikan
Found that an electron was actually using negative force. -
Neils Bohr
He discovered the atomic nucleus while he was studying atoms. -
James Chadwick
Is the man that discoved the neutron.