Here's how to figure that out:

* Lithium (Li) is in group 1 of the periodic table, meaning it has a +1 charge as an ion (Li+).

* Chlorine (Cl) is in group 17 of the periodic table, meaning it has a -1 charge as an ion (Cl-).

To form a neutral compound, you need one lithium ion (Li+) to balance one chloride ion (Cl-).