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What is the correct formula unit for the ionic compound, lithium sulfide?

a
Li2S

b
LiS

c
LiS8

d
LiS2

1 answer

The correct formula unit for the ionic compound lithium sulfide is:

a) Li2S

Lithium (Li) has a +1 charge and sulfide (S) has a -2 charge. To balance the charges, two lithium ions are needed for each sulfide ion, which results in the formula Li2S.