Atomic Theory History

Front

Who was the first person to study atomic theory?

Back

Democritus

Front

What is the correct order of the Atomic Theory Timeline?

Back

Democritus, Dalton, Thomson, Rutherford, Bohr

Front

True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus.

Back

False

Front

Which scientist created the planetary model of the atom?

Back

Niels Bohr

Front

Who developed the 'billiard ball' model of the atom?

Back

John Dalton

Front

What did Democritus propose about atoms?

Back

He proposed that atoms are indivisible and make up all matter.

Front

What was John Dalton's contribution to atomic theory?

Back

He proposed that each element is made of atoms that are identical in mass and properties.

Front

What did J.J. Thomson discover?

Back

He discovered the electron and proposed the 'plum pudding' model of the atom.

Front

What is Rutherford's gold foil experiment known for?

Back

It demonstrated that atoms have a small, dense nucleus.

Front

What did Bohr's model of the atom introduce?

Back

It introduced the idea of quantized energy levels for electrons.