1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

Atomic Number Definition

Glossary Definition of Atomic Number


Hydrogen has an atomic number of 1.

Protium is an isotope of the element hydrogen, which has one proton and thus an atomic number of 1. Protium has one proton and one electron, but no neutrons.

Blacklemon67, Wikipedia Commons

Atomic Number Definition: The number of protons in an element.

Examples: The atomic number of hydrogen is 1; the atomic number of carbon is 6.

Also Known As: The atomic number is also known as the proton number. It may be represented by the capital letter Z.

Related Video
Video: Trends in the Periodic Table

©2014 About.com. All rights reserved.