Subjective Type

In thiocyanate ion, what is the formal charge on the sulfur atom?

Solution

The formal charge on sulfur is zero.

The typical Lewis representation of thiocyanate anion is as $$S=C=N^-.$$

There are:

$$6(S)+4(C)+5(N)+1 (\text{negative charge})=16$$ valence electrons, to distribute about 3 atoms.

And from left to right: $$:\overset{..}{S}=C=\overset{..}{N}:^-$$, there are 6 (2 lone pairs on sulfur), 4 (C), and 6 (N) valence electrons associated with each atom. The formal charge is thus $$0,0,-1.$$ That the negative charge is associated with the nitrogen atom is reasonable given that this is the most electronegative atom.

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