Front

What is the mass number of an element?

Back

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

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

How many protons does an atom of Oxygen have?

Back

An atom of Oxygen has 8 protons.

Front

What is the relationship between protons and atomic number?

Back

The atomic number of an element is equal to the number of protons in its nucleus.

Front

What are isotopes?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the atomic number of Calcium?

Back

The atomic number of Calcium is 20.

Front

How many neutrons are in a neutral atom of Calcium with a mass number of 40?

Back

A neutral atom of Calcium with a mass number of 40 has 20 neutrons.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the mass number of an element with 8 protons and 8 neutrons?

Back

The mass number is 16.

Front

What particle is equal to the atomic number of an element?

Back

The number of protons is equal to the atomic number.