E-27

Question 1

Discovered the proton and nucleus

Answer 1

Rutherford

Question 2

Began the modern-day study of atoms
His idea that the atom is a solid sphere

Answer 2

Dalton

Question 3

Determined the charge of the electron (-1)

Answer 3

Millikan

Question 4

Described the “orbits” of electrons in energy levels

Answer 4

Bohr

Question 5

First theorized the existence of atoms

Answer 5

Democritus

Question 6

Discovered the neutron

Answer 6

Chadwick

Question 7

Discovered the presence of the electron
Plum pudding

Answer 7

Thomson