Atomic number
This is the current revision of Atomic number as edited by Iduan (talk | contribs) at 16:32, March 29, 2009. This URL is a permanent link to this version of this page.
The atomic number is the number of protons in an atom's nucleus.[1] (It is also the number of electrons surrounding the nucleus, if the atom is electrically neutral.) In many representations of the periodic table of the elements this number is placed either above the element's symbol or in the upper right hand corner.