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In decreasing order of priority

Element Valence Prefix
Oxygen II Oxa
Sulfur II Thia
Selenium II Selena
Tellurium II Tellura
Nitrogen III Aza
Phosphorus III Phospha
Arsenic III Arsa
Antimony III Stiba
Bismuth III Bisma
Silicon IV Sila
Germanium IV Germa
Tin IV Stanna
Lead IV Plumba
Boron III Bora
Mercury II Mercura

This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

Published with permission of the IUPAC by Advanced Chemistry Development, Inc.,, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact