History of Atomic Theory Quiz

Who first proposed the idea that matter is made up of indivisible particles?

• Democritus

• John Dalton

• Ernest Rutherford

• J.J. Thompson

What was the main feature of J.J. Thompson's plum pudding model?

• A nucleus with protons and neutrons

• Electrons orbiting the nucleus

• Electrons embedded in a positive sphere

• Atoms as solid spheres

What did Rutherford's gold foil experiment demonstrate about the atom?

• Atoms are solid spheres

• Atoms are indivisible

• Atoms have a dense central nucleus

• Electrons orbit in fixed paths

How did Niels Bohr improve upon Rutherford's model of the atom?

• By proposing the plum pudding model

• By discovering neutrons

• By suggesting electrons orbit in shells

• By introducing the concept of protons

Who provided evidence for the existence of neutrons in the nucleus?

• John Dalton

• Niels Bohr

• James Chadwick

• J.J. Thompson