Atomic Theory and Atomic Structure

Front

What is the atomic mass of an atom?

Back

The atomic mass of an atom is equal to the number of protons plus the number of neutrons.

Front

What subatomic particle did J.J. Thomson discover?

Back

Electrons.

Front

What are isotopes?

Back

Atoms with the same number of protons but different numbers of neutrons.

Front

What is the atomic mass?

Back

The weighted average of all isotopes found in nature for a specific element.

Front

What model of the atom did J.J. Thomson propose?

Back

The plum pudding model.

Front

What is the charge of an electron?

Back

Negative.

Front

What is the nucleus of an atom composed of?

Back

Protons and neutrons.

Front

What is the difference between atomic number and mass number?

Back

Atomic number is the number of protons in an atom, while mass number is the total number of protons and neutrons.

Front

What is the significance of the atomic number?

Back

It determines the identity of an element.

Front

What are the three main subatomic particles?

Back

Protons, neutrons, and electrons.