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Democritis
Democritis's theory was that all matter was made up of atoms. -
John Dalton
His theory was that all matter was made up of atoms from different weights -
J.J Thomson
J.J. Thomson-1898---J.J Thomson was the first to discover the electron. He was the first scientist to discover electrons -
Philipp Lenard
Lenard did a lot of work with cathode rays but his contribution to the periodic table was that he proposed a model of an atom to have both a positive and negative charge bound. -
Ernest Rutherford
His theory of the structure of atoms was to do with nuclear -
Neils Bohr
He made alot of contributions to the quantum mechaincs and atomic structure. -
James Chadwick
He discovered neutrons.