History of the atom

Question 1

who invented the plum pudding model?

Answer 1

jj.thompson in 1904

Question 2

what was the plum pudding model?

Answer 2

a sphere of positive charge, embedded with negatively charged particles called electrons

Question 3

who invented the nuclear model of the atom?

Answer 3

Rutherford by the scattering experiment

Question 4

what was the nuclear model of the atom?

Answer 4

proved the existence of a positively charged nucleus and that the mass of the atom was concentrated inside the nucleus and most of the atom is empty space.

Question 5

what was the scattering experiment?

Answer 5

Rutherford fired alpha particles at thin gold foil, most particles went through, some were slightly deflected and some repelled back to where they were fired from proving the existence of a positively charged nucleus in the middle of the atom and most of the atom is empty space.

Question 6

what did Niels Bohr suggest?

Answer 6

Electrons orbit the nucleus at certain distances, called energy levels, now called electron shells.

Question 7

who discovered the existence of the neutron?

Answer 7

James Chadwick

Question 8

what is an isotope?

Answer 8

An atom with the same number of protons but different number of neutrons