Inorganic mercury compounds are formed when mercury (symbol Hg) combines with
elements other than carbon, such as chlorine, sulfur, or oxygen.
Elemental mercury is a form of inorganic
mercury.
Mercury binds in two states:
Hg+ (mercurous or mercury I), and
Hg2+ (mercuric or mercury II).
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Examples of mercury salts are:
mercuric sulphide or mercury II sulphide (HgS),
mercuric oxide or mercury II oxide (HgO) and
mercuric chloride or mercury II chloride
(HgCl2).
Mercury salts are usually white powders or crystals. Mercuric
sulphide, which is normally red, is an exception.