Question

In which of the following species central atom is not surrounded by exactly 8 valence electrons ?

• A. $B{F}_4^{-}$
• B. $NC{l}_3$
• C. $PC{l}_4^{+}$
• D. $S{F}_4$

Answer 1

The correct option is D $S{F}_4$

In $S{F}_4$ central sulphur atom has $s{p}^{3}d$ hybridisation. Sulphur atom has 6 valence electrons around them and four 4 electrons are donated by the F atom during the covalent bond formation.

So the total number of electrons around the central sulphur atom will be $(6+4)=10$ electrons.

So, option D is correct.