Which of the following statements is true?

Options

A. Elements in and beyond third period have only 3s-and 3p-orbitals available for bonding.
B. In a large number of compounds of elements of third period there are less than eight valence electrons around the central atom.
C. In `PF_(5)` and `SF_(6)` the central atoms have an expanded octet.
D. none of these.

Answer

C

Explanation

`PF_(5)` have `5 xx 2 = 10` electrons in valence shell while `SF_(6)` have 12 electrons.