What is ATOMIC NUMBER?

The number of protons in the nucleus of an atom (identical to the charge number of the nucleus) represented by the symbol Z. It uniquely identifies a chemical element.

ATOMIC NUMBER: "Atomic number of the helium is 2."

Link to This Definition

Did you find this definition of ATOMIC NUMBER helpful? You can share it by copying the code below and adding it to your blog or web page.
Edited and fact checked by Pam: Google +