Answer:
(i)
Valency of element 'A' = 8 - 5 = 3
(ii) Valency of element 'B' = 12 - 10 = 2
(in) Valency of element 'C' = 14 - 10 = 4
(iv) Valency of element 'D' = 18 - 17 = 1
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