Question

For the spectroscopic notation:
2-8-18-5

1)What does the element do to make the outer shell complete?
2) What would be the charge on the ion the forms as a result?
3) What is the spectroscopic notation fpr each shell

Thanks!

Answer 1

I don't consider 2-8-18-5 a spectroscopic notation.
In order:
1. It adds three electrons to make 3 in the last shell.

2. If it adds three electrons, each with a -1 charge, then there will be a charge of -3 on the ion.

3. Since I, obviously, don't know what you mean by spectroscopic notation you will need to figure this one out. I would write the orbital notation as
1s2 2s2 2p6 3s2 3p6 3d10 2s2 2p6 for the -3 ion (after the three electrons have been added).