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400
Democrutis
Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. His -
400
Democtirus model
His model was the picture of the atom. -
John Dalton
- All matter is made of atoms. Atoms are indivisible and indestructible.
- All atoms of a given element are identical in mass and properties
- Compounds are formed by a combination of two or more different kinds of atoms.
- A chemical reaction is a rearrangement of atoms.
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John Dalton model
The different parts of the atoms. -
JJ Thomson
Discovered the electron. JJ also had a plum pudding model which is a obsolete scientific model of an atom. -
JJ Thomson model
JJ used the plum pudding model to discover the electron. -
Robert Millikan
Robert Millikan measured the charge on an electron. -
Robert Milikan model
Robert used the oil drop experiment to find the charge of an electron. -
Ernest Rutherford
He discovered Alpha and Beta rays and nearly the total mass of an atom is concentrated in a nucleus. Composed the nuclear atom. -
Ernest Rutherford model
The model he used to find the atomic mass of an atom. -
Niels Bohr
Bohr discovered the atomic nucleus. -
Niels Bohr model
Niels model to find the atomic nucleus. -
James Chadwick model
James Chadwick's model to discover the neutron. -
James Chadwick
James discovered the neutron.
