Protons, Neutrons, & Electrons

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 does silicon have?

Back

Silicon has 14 protons.

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 (it is neutral).

Front

How many electrons does helium have?

Back

Helium has 2 electrons.

Front

What is the mass number of an atom?

Back

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

Front

How many neutrons does lithium have?

Back

Lithium has 4 neutrons.

Front

What is the best mass number for silver?

Back

The best mass number for silver is 108.

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.