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400 BCE
Democritus
He found that Everything is composed of atoms, which are indestructible, and they will always be in motion -
Dalton
All matter is made up of atoms, and atoms are indivisible and indestructible -
JJ Thomson
He found that atoms have electrons using CRT -
Rutherford
He determined the true nature of the atom, and the phenomenon of radioactivity. He also found that unstable nuclei emit alpha particles -
Henry Moseley
He found that all atoms of a certain element contain the same amount of protons -
Erwin Schrodinger
He took the Bohr atom model and improved by using mathematical equations to describe the possibility of finding electrons in certain positions