Pleaseeeeeeee help meeee.
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(a) I didn't know.
(b) e is a inert gas as it is present in 18th group.
(d) Between cand b-> ionic bond
Between a and d-> covalent bond
(e) Valency of A-> 4
Valency of B-> -1
Valency of C-> 2
Valency of D-> -2
(c) I don't know
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