Sodium sulphide is an ionic compound and written as (by showing its charges)

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Na-2 S2-

Na+2 S2-

Na20S2-

Na+2 S0

answer is B.

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Detailed Solution

Valence electrons in Na = ICharge on Na = + 1.Valence electrons in S = 6.Charge on S = -2So, sodium sulphide (with its charges) is written as (Na)2 S2-

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