Final answer:
The correct formula for the ionic compound formed between lithium and bromide is LiBr, as lithium and bromide ions combine in a one-to-one ratio.
Step-by-step explanation:
The formula for the ionic compound formed between lithium and bromide is LiBr. Lithium, which has a charge of +1 (Li+), and bromide, with a charge of -1 (Br−), combine in a one-to-one ratio to neutralize each other's charges, resulting in the neutral ionic compound LiBr. This follows the crisscross method, where the numerical value of the charge of one ion is used as the subscript for the other ion after crossing them over, ignoring the signs of the charges.