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Antoine Lavoisier
Known as the "father of modern chemistry," he developed a system for naming chemicals. -
John Dalton
-First person to define an element as a pure substance.
-Came up with the 'billard ball' model of the atom, which was the first theory of atomic structure. -
J.J Thomson
Discovered electrons and came up with the "raisin bun" or "plum pudding" model of the atom; This showed the atom as a positive sphere with electrons (negative charges) embedded in it. -
Today
The quantum mechanics model of the atom is used today; This says that an atom is a cloud of electrons surrounding a nucleus.
