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Atomic Number

http://en.wikipedia.org/wiki/Atomic_number

http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31895

http://www.iso.org/iso/catalogue_detail?csnumber=31894

The "Atomic Number", also known as the proton number, is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. A nuclide is a species of atom with specified numbers of protons and neutrons. Nuclides with the same value of Z but different values of N are called isotopes of an element. The ordinal number of an element in the periodic table is equal to the atomic number. The atomic number equals the charge of the nucleus in units of the elementary charge.

Z