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.
Atomic Number Definition
Glossary Definition of Atomic Number
By Anne Marie Helmenstine, Ph.D., About.com Guide
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.
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Atomic Number Information
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