Atomic Structure

Front

What is the atomic number?

Back

The number of protons in the nucleus.

Front

What is the mass number?

Back

The number of protons and neutrons in the nucleus.

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

How do you calculate the mass number of an element?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is an isotope?

Back

Atoms of the same element with the same number of protons but different numbers of neutrons.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of a neutron?

Back

No charge (neutral).

Front

What is the charge of an electron?

Back

Negative charge.

Front

What determines the identity of an element?

Back

The number of protons in its nucleus.

Front

If an atom has 12 protons, what is its atomic number?

Back

12.