Question

Which of the following elements can have an expanded octet? 1-O 2-Cl 3- N 4-H 5- He

Answer 1

A:- Octate rule:

                      According to the octate rule the central atom of the compound has 8 electrons, such compounds are more stable. For example CH4 has 8 electrons around the sphere of C-atom, hence it more stable.

Expanded octate means more tha 8 electrons around the central atom in a compound. But in the given example no element has more than 8 electrons.

A:- None of the given

Expanded octate only possible for the elements, when the valence electrons are present in the d-orbitals.