-
Jan 1, 1000
Democritus
Greek philosopher who first invented the atomic theory in 400 B.C. -
antoine lavoisier
excellent experimenterproposed combustion theory and law of conservation of mass -
John Dalton
Matter is composed of extermely small particles called atoms. Atoms cannot be created, divided, or destroyed. -
J.J. Thomson
He discovered the electron, the isotope and the invention of the mass spectrometer -
dimitri mendel
proposed the periodic table
