Atoms and Periodic Table

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 in an atom?

Back

Protons, neutrons, and electrons.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.

Front

What is the charge of an electron?

Back

Negative.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

How do you determine the number of electrons in a neutral atom?

Back

In a neutral atom, the number of electrons equals the number of protons.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What is the overall charge of the nucleus?

Back

Positive.

Front

What is the mass number of an atom?

Back

The sum of protons and neutrons in the nucleus.