give examples of eight metals which show variable valency
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Copper. Cu⁺(Cuprous), Cu²⁺(Cupric)
Cobalt. Co²⁺(Cobaltous), Co³⁺(Cobaltic.
Iron. Fe²⁺(Ferrous), Fe³⁺(Ferric)
Lead. Pb²⁺(Plumbous), Pb⁴⁺(Plumbic)
Mercury. Hg₂²⁺(Mercurous), Hg²⁺(Mercuric.
Tin. Sn
Cobalt. Co²⁺(Cobaltous), Co³⁺(Cobaltic.
Iron. Fe²⁺(Ferrous), Fe³⁺(Ferric)
Lead. Pb²⁺(Plumbous), Pb⁴⁺(Plumbic)
Mercury. Hg₂²⁺(Mercurous), Hg²⁺(Mercuric.
Tin. Sn
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