Atomic Theory Review

The name Democritus gave us the smallest possible particle of matter is

• molecule

• atom

• electron

• proton

Atoms with the same number of protons, but different number of neutrons are called

• isotopes

• neutral

• ions

• isolines

Tags

NGSS.HS-PS1-8

This scientist used Alpha Particles and Gold Foil to discover the nucleus of the atom.

• JJ Thomson

• James Chadwick

• Ernest Rutherford

• Niels Bohr

Niels Bohr found that electrons move in definite orbits around the

• element

• atom

• nucleus

• sun

Thompson's model of negative electrons randomly distributed through a positively charged matrix is called the -

• plum pudding model

• atomos

• bohr model

• gold foil model

The "planetary model", showing electrons orbiting the nucleus, was developed by -

• Ernest Rutherford

• JJ Thompson

• Niels Bohr

• James Chadwick

Tags

NGSS.MS-PS1-1

In 1911 I discovered that atoms have a positive particle called proton.

• Dalton

• Rutherford

• Chadwick

• Bohr