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Question
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
Solution
(a) Y + 3e-→ Y3-
(b) 3X +Y2 → X3Y2
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