-
464 BCE
Democritus
round with no electrons, protons or neutrons. -
John Dalton
round with no electrons, protons or neutrons -
Jj Thomson
a bunch of electrons surrounded by a soup of positive charge to balance the electrons' negative charges. -
Ernest Rutherford
the atom has a tiny and heavy nucleus -
Neils Bohr
the atom is a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. -
James Chadwick
positively charged nucleus surrounded by negatively charged electrons.
