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It's defined by the protons, whether ionized or not.
The atomic number is the number of protons or electrons in a neutrally charged atom's nucleus. 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.
The atomic number is the number of protons in an atom's nucleus.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> (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.
==See also==
*[[Mass number]]
==References==
<references/>
[[Category:Chemistry]]
[[Category:Chemistry]]
[[Category:Physics]]