Parts of an atom

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What are the three main types of subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of an electron?

Back

Negative.

Front

What is the charge of a neutron?

Back

Neutral.

Front

Where are protons and neutrons located in an atom?

Back

In the nucleus.

Front

What is the nucleus of an atom?

Back

The central region of an atom that contains protons and neutrons.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What is an electron cloud?

Back

The region around the nucleus where electrons are likely to be found.