-
Democritis's theory was that all matter was made up of atoms.
-
His theory was that all matter was made up of atoms from different weights
-
J.J. Thomson-1898---J.J Thomson was the first to discover the electron. He was the first scientist to discover electrons
-
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.
-
His theory of the structure of atoms was to do with nuclear
-
He made alot of contributions to the quantum mechaincs and atomic structure.
-
He discovered neutrons.