HISTORY OF THE ATOM

Question 1

What did Democritus propose about atoms?

Answer 1

Atoms are solid and different shapes that make up everything

Democritus is known as one of the earliest proponents of the atomic theory.

Question 2

What is Dalton’s atomic model known as?

Answer 2

Billiard ball model

Dalton’s model suggests that atoms of the same element are identical.

Question 3

What did Thomson discover and what model did he propose?

Answer 3

Discovered electrons and proposed the plum pudding model

Thomson’s model depicts atoms as a positively charged ‘pudding’ with negatively charged electrons embedded within.

Question 4

What significant experiment did Rutherford conduct?

Answer 4

Gold foil experiment

This experiment led to the discovery of the positive nucleus of the atom.

Question 5

What concept did Bhor introduce regarding electrons?

Answer 5

Electrons are organized on different energy levels

Bhor’s model improved upon earlier atomic models by introducing quantized energy levels for electrons.