Atomic Number and Mass

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 number of protons in an atom of carbon?

Back

Carbon has 6 protons.

Front

What does the atomic mass represent?

Back

The atomic mass represents the total number of protons and neutrons in an atom.

Front

What particles make up the nucleus of an atom?

Back

The nucleus is made up of 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 (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

How do you calculate the atomic mass of an element?

Back

Atomic mass = number of protons + number of neutrons.

Front

What is the relationship between atomic number and the number of electrons in a neutral atom?

Back

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

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table.