Which scientist was the first person responsible for proposing the discovery of the electron?

Which scientist was the first person responsible for proposing the discovery of the nucleus?

Which scientist claimed that the atom was a small, dense, solid sphere?

Which scientist's model is referred to as the Plum Pudding Model?

Which scientist's model is referred to as the Planetary model?

Which scientist proposed the idea that the electrons orbited the nucleus on fixed paths with designated energies?

Which scientist proposed that the atom was indivisible using the word "atomos"?

Which model of the atom is the most up to date model?

Which model of the atom describes the location of electrons as probable within a dense "cloud" surrounding the nucleus of an atom?