Wtite the name ,symbol and valency of element that exhibit variable valency.
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suryasunnetha:
copper's valencies are incorrect
sorry by fault now corrected
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iron (fe)
valencies :+2(ferrous),+3(ferric)
copper(cu)
valecies:+1(cuprous),+2(cupric)
valencies :+2(ferrous),+3(ferric)
copper(cu)
valecies:+1(cuprous),+2(cupric)
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