Atomic Structure

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons are in an atom with an atomic number of 9?

Back

9 protons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

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

Front

What are the three main subatomic particles?

Back

Protons, Neutrons, and Electrons.

Front

Which subatomic particles are found in the nucleus of an atom?

Back

Protons and Neutrons.

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

If an atom has 10 neutrons and 9 protons, what is its mass number?

Back

19 (9 protons + 10 neutrons = 19).

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (neutral).