variable velancy of lead
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Element Symbol Valency Ions Nomenclature
Copper Cu 1, 2 Cu1+
Cu2+ Copper [I] or Cuprous
Copper [II] or Cupric
Silver Ag 1, 2 Ag1+
Ag2+ Silver [I] or Argentous
Silver [II] or Argentic
Mercury Hg 1, 2 Hg1+
Hg2+ Mercury [I] or Mercurous
Mercury [II] or Mercuric
Iron Fe 2, 3 Fe2+
Fe3+ Iron [II] or Ferrous
Iron [III] or Ferric
Tin Sn 2, 4 Sn2+
Ag4+ Tin [II] or Stannous
Tin [IV] or Stannic
Lead Pb 2, 4 Pb2+
Pb4+ Lead [II] or Plumbous
Lead [IV] or Plumbic
Phosphorus P 3, 5
Sulfur S 4, 6
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The valency of an element is always a whole number. Some elements exhibit more than one valency, i.e., they have variable valency.
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Do Some Elements Have Variable Valencies?
ElementLeadSymbolPbValency2, 4IonsPb2+ Pb4+NomenclatureLead [II] or Plumbous Lead [IV] or Plumbic
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