-
465
Democirtus
Atom's cannot be destroyed, differ in size, shape and temperature, are always moving and are invisible. -
465
Democritus
-
John Dalton
All matter is made of atoms. Atoms are invisible and indestructible. Identical in mass and properties. Compounds are two or more different atoms. A chemical reaction is a rearrangement of atoms. -
John Dalton
-
J.J. Thomson
-
J.J. Thomson
Identified the negatively charged electron -
Robert Milliken
-
Robert Milliken
Determined the charge of the eletron using the oil drop experiment -
Ernest Rutherford
Proposed the nuclear atom as a result of the gold foil experiment -
Ernest Rutherford
-
Neils Bohr
Proposed the atomic nucleus -
Neils Bohr
-
James Chawick
Discovered the neutron -
James Chadwick
