-
Leucippus and Democritus Theory
They came up with the idea that matter is composed of tiny particles. This brought up the atom. -
Antoine Lavoiser
He came up with Law of Conservation of Mass. Which states even if matter changes forms its mass stays the same. It more explained atoms. -
John Dalton
He discovered that elements existed even as packets of matter. This told you were atoms existed. -
Discharge Tubes
Scientist started proving what stuff was made of using discharge tubes. This help discover protons and electrons. -
Oregon Gonstein
He proved that matter must have a positive charge also. This changed the way people observed atoms. -
J.J. Thompson
He measured how much heat the cathodes generated. He was able to estimate the mass of the rays. He discovered the electrons. -
Earnest Rutherford
He did an experiment using an extremely thin piece of gold foil and a screen coated with zinc. He called the center of the atom the nucleus. He discovered Protons and Protons make up the atom's nucleus. -
Niels Bohr
He came up with the Bohr model. Which helps us determine how many atoms an elements has. -
Werner Heisenburg
He discovered that it is impossible to know with most certainty the momentum of an atom and its position. -
Quantum Theory
Heisenberg and other scientist created this theory that stated that electrons weren't particles or waves that they had properties of both and neither.