How to name an element in Variable valency?
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Valency is the number of hydrogen atoms that can combine with (or displace) one atom of the element to form a compound.
Some elements have variable valencies
Element - Lead
Symbol- Pb
Valency- 2,4
Ions- Pb2+,Pb4+
Nomenclature -Lead(2)or plumbous
Lead (4)or plumbic
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