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101
Democritus
The theory is that all atoms are all created individually and cannot be seperated, no matter what scientific procedures are applied. -
John Dalton
All matter is made of atoms. Atoms are indivisible and indestructible.
All atoms of a given element are identical.
Compounds are formed by a combination of two or more different kinds of atoms. -
JJ Thomson
He used the Cathode Ray Tube to prove his theory. Thomson found the particle called electron. -
Hantaro Nagaoka
thought that an atom has a central nuclues. Electrons move in orbit like the rings around saturn. -
Ernest Rutherford
He thought atoms had a central postive nucleus surrounding by negative orbiting electrons. -
Neils Bohr
He thought electrons move in spherical orbits at fixed distances from the nuclues. -
Erwin Schrodinger and Werner Heisenberg
He used mathematical equations to describe the motion of electrons in atoms. His work leads to electron cloud model. -
James Chadwick
He comfirmed the existence of nuetrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons.
