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

Answer 1

Noah Aldrich

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

For example, the electron configuration of elemental carbon is:

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

Still, if it picks up four extra electrons...

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

and subsequently turns isoelectronic to Neon. As a result, an electron-rich carbon atom has the following electronic configuration:

#C= [Ne]#

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Answer 2

Axel Alvarado

If the number of electrons in two elements differs, then they are not isoelectronic.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.