Atoms

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 subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What charge does a proton have?

Back

A proton has a positive charge.

Front

What charge does a neutron have?

Back

A neutron has no charge (neutral).

Front

What charge does an electron have?

Back

An electron has a negative charge.

Front

How many protons does an atom of carbon have?

Back

6 protons.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

How many electrons does an atom of oxygen have?

Back

8 electrons.

Front

What is the outer shell of an atom?

Back

The outer shell is the highest energy level of electrons in an atom.

Front

How many electrons can the outer shell hold?

Back

The outer shell can hold a maximum of 8 electrons.