does Mercury has variable valency?
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mercury (Mg) has variable valency.
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yes it has variable valency
lead
Explanation: lower valency +1 (mercurous )
upper valency +2 (mercuric)
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and also when there is a variable valency in any case the lower valency has a suffix -ous and upper valency a suffix -ic . it also works for the elements like copper , iron , manganese , lead etc
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