Introduction to 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 of an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons have?

Back

Protons have a positive charge.

Front

What charge do neutrons have?

Back

Neutrons have no charge (they are neutral).

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

Where are protons and neutrons located in an atom?

Back

Protons and neutrons are located in the nucleus of the atom.

Front

Where are electrons located in an atom?

Back

Electrons are located in the electron cloud surrounding the nucleus.

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

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

Which subatomic particles contribute to the mass of an atom?

Back

Protons and neutrons contribute the most to the mass of an atom.