Question

Question #c21cf

Answer 1

You have two answers. For this one I would use the method where you find the closest gas, since 28 is a long one.

`Ni=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8`

`Ni=[Ar]4s^2 3d^8`

Explanation:

This is a concept that takes a while to explain without a periodic table, so I am going to attach this link to a video that explains it pretty well.