posted by Tracey .
Consider the following electron configuration.
(σ3s)2 (σ3s*)2 (σ3p)2 (π3p)4 (π3p*)4
Select four species that, in theory, would have this electron configuration.
This looks like diatomic species (molecules or ions) of third row elements with 14 electrons. It may be Cl2, SCl-, etc. You should be able to come up with a couple more.