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Pnictogen
A pnictogen is one of the chemical elements in group 15 of the periodic table. This group is also known as the nitrogen family. It consists of the elements nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi) and the synthetic element ununpentium (Uup) (unconfirmed).
In modern IUPAC notation, it is called Group 15. In CAS and the old IUPAC systems it was called Group VA and Group VB respectively (pronounced "group five A" and "group five B", "V" for the Roman numeral 5). In the field of semiconductor physics, it is still usually called Group V.〔For example, a (2005 book ) is titled ''Properties of group-IV, III-V and II-VI semiconductors''.〕 The "five" ("V") in the historical names comes from the "pentavalency" of nitrogen, reflected by the stoichiometry of compounds such as N2O5.
The term ''pnictogen'' (or ''pnigogen'') is derived from the Ancient Greek word πνίγειν (''pnígein'') meaning "to choke", referring to the choking or stifling property of nitrogen gas.
==Characteristics==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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