What is the formula unit for a compound made from Li and Cl?

LiCl

Explanation:

The formula unit of compound made from Li and Cl is LiCl.

The charge on Cl is - 1 and on Li is + 1.

Lithium is present in group one.

It has one valance electron.

It loses its one valance electron and get stable.

Chlorine is present in group seventeen.

It have seven valance electron.

It needed one electron to complete the octet.

When both atom combine the positive and negative charges are equal and cancel each other. Thus make a compound over all neutral.

The compound made by lithium and chlorine is Lithium chloride and formula is LiCl.