Question

How do you determine whether a element is not isoelectronic with another element?

Answer 1

Look at the electron configuration for the element, and see if they have the same configuration.

Explanation:

For instance elemental carbon has an electron configuartion of:

`C = [He]2s^2 2p^2`

But if it gains four more electron...

`C =[He]2s^2 2p^6` which is an identical electron configuration to `[Ne]`

And then becomes isoelectronic to Neon. So then electronically a carbon atom which has gained four electron has a configuartion of:

`C= [Ne]`