valency of sodium is 1. (Give reason)
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Sodium loses its one electron and completes its octet and chlorine accepts this electron. They are bonded through the ionic bond.
Na → Na+ + e−
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valency of an element is a number of atoms present in it outermost shell atomic number of sodium is 11. hence it's electronic configuration is 2,8,1 only one atom is present in the outermost orbit, therefore valency of sodium is 1.
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