Here's why:
* Lithium (Li) is in Group 1 of the periodic table, meaning it has a +1 charge as an ion (Li⁺).
* Iodine (I) is in Group 17 of the periodic table, meaning it has a -1 charge as an ion (I⁻).
To form a neutral compound, the charges must balance. Since lithium has a +1 charge and iodine has a -1 charge, they combine in a 1:1 ratio.
