Atomic Structure

Front

What is the atomic number?

Back

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

Front

What is the mass number?

Back

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

Front

Where is most of the mass in an atom located?

Back

Most of the mass in an atom is located in the nucleus.

Front

What must an atom have to be considered neutral if it has 12 positively charged subatomic particles?

Back

It must have 12 electrons.

Front

What must be true for an atom to be neutral?

Back

The atom must have the same number of protons and electrons.

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

How do you calculate the mass number of an atom?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the charge of a neutron?

Back

Neutrons have no charge (they are neutral).