Question

An element X has valency 3 and an element Y has valency 2 . write the formula of the compound between X and Y

Answer 1

• The formula for compounds with valency 2 and 3 is -${\mathrm{X}}_2{\mathrm{Y}}_3$
• This formula is formed between X and Y by crossing the valencies of the constituent elements, like X share its 2 electrons with Y and Y share its 3 electrons with X.
• Hence the formula of a compound with valency 2 and 3 is ${\mathrm{X}}_2{\mathrm{Y}}_3$.
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