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460
Democritus
Democritus belived all matter consistd of small particles that could not be divided. He called the particles atoms. He called them this because in greek this word means uncut or indivisble. -
John Dalton
John pictures atoms as tiny, indestructible particles, with no internal structure. -
J.J. Thomson
He discoverd the electron. He pictures electrons embedded in a sphereof positive electric charge. -
Hantaro Nagaoka
He sugest that a atom has a central nucleus. Electons move in orbits like the rings around saturn. -
Ernest Rutherford
He states a atom has a dense, positively charged nucleus. Electrons move randomly in the space around the nucleus. -
Werner Heisenberg & Erwin Schrodinger
Developed a mathamatical equations to describe the motion of electons in atoms. His work lead to the electron cloud model. -
James Chadwick
He confirms the exsitence of neotrons that have no charge and protons that have a charge. -
Neils Bohr
Electrons move in spherical orbits at fixed distances from the nucules.
