Question

Worth 80 points!!! I forget energy shells

Answer 1

This is the 1s2p etc valence electron energy shells idea.
I think you have to consider the section of the table with a certain number of electrons perhaps the noble gases

Answer 2

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.