Question

Why do third period elements expand their covalence above four?

Answer 1

Explanation:

However, some of the third-period elements (Si, P, S, and Cl) have been observed to bond to more than four other atoms, and thus need to involve more than the four pairs of electrons available in an s2p6 octet. ... Therefore, the d orbitals participate in bonding with other atoms and an expanded octet is produced.

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Answer 2

Answer:

The octet rule can expanded by some elements by utilizing d− orbitals found in the 3rd principal energy level and beyond. So, atoms like sulphur, phosphorous, chlorine are common examples of elements that form an expanded octet.

For example- SF6,PCl5, etc.