Which is the outermost shell of hydrogen atom?

When the number of the valence electrons in an element X is 4 or more than 4, does ‘(8-number of valence electrons)’ match with the valency of that element? How many electrons are used to complete the octet?

Atomic numbers (Z) of some elements are given here. Write down the number of electron present in the outermost shell of each of them.

The number of electrons of some elements is given here. By using it write the electronic configuration, number of valence electron and valency of the respective elements.