Early Atomic Theories

Front

What did J.J. Thomson discover?

Back

The electron.

Front

What model of the atom is J.J. Thomson known for?

Back

The 'Plum Pudding' model.

Front

What did Niels Bohr propose about electron arrangement?

Back

Electrons are found in specific orbits around the nucleus.

Front

What is the charge of an electron?

Back

Negative.

Front

What did John Dalton contribute to atomic theory?

Back

He proposed that every element consists of one type of atom.

Front

What is the main idea of Dalton's atomic theory?

Back

Atoms are indivisible and combine in simple whole-number ratios to form compounds.

Front

Who proposed the nuclear model of the atom?

Back

Ernest Rutherford.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

The existence of a small, dense nucleus within the atom.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.