Atomic Structure

Front

What is the mass number of an atom?

Back

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

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus.

Front

If an atom has 10 protons and 15 neutrons, what is its mass number?

Back

The mass number is 25 (10 protons + 15 neutrons).

Front

Where are electrons located in an atom?

Back

Electrons are found in spaces around the nucleus of the atom.

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

How do you find the number of neutrons in an atom?

Back

The number of neutrons is found by subtracting the number of protons from the mass number.

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 (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

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.