Unit 3 Review Part I and II

Front

What are protons and neutrons?

Back

Protons and neutrons are subatomic particles found in the nucleus of an atom. They are about the same size and mass.

Front

Who is known for the cathode ray experiment?

Back

J.J. Thomson is known for performing the cathode ray experiment, which led to the discovery of electrons.

Front

What did J.J. Thomson discover about atoms?

Back

J.J. Thomson discovered that atoms are divisible, meaning they can be broken down into smaller particles.

Front

What are the charges of protons, neutrons, and electrons?

Back

Protons have a positive charge (+), neutrons have no charge (neutral), and electrons have a negative charge (-).

Front

What is the significance of the cathode ray experiment?

Back

The cathode ray experiment demonstrated that cathode rays are composed of negatively charged particles, later identified as electrons.

Front

Who proposed the atomic theory that states atoms are indivisible?

Back

John Dalton proposed the atomic theory that initially stated atoms are indivisible, although this was later revised.

Front

What is the mass comparison between protons, neutrons, and electrons?

Back

Protons and neutrons have approximately the same mass, while electrons have a much smaller mass.

Front

What did Rutherford's gold foil experiment reveal?

Back

Rutherford's gold foil experiment revealed that atoms have a small, dense nucleus at their center.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

Front

What is the role of electrons in an atom?

Back

Electrons orbit the nucleus of an atom and are involved in chemical bonding.