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

How do you calculate the mass number of an atom?

Back

Mass number = Number of protons + Number of neutrons.

Front

What particles are found in the nucleus of an atom?

Back

The nucleus contains protons and neutrons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

How many electrons are in a neutral atom?

Back

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

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.