Here's how to break it down:
* Lithium (Li): Lithium is a group 1 element with a +1 charge.
* Persulfate (S₂O₈²⁻): Persulfate is a polyatomic ion with a -2 charge.
* Balancing the Charges: To balance the charges, we need two lithium ions (2 x +1 = +2) to combine with one persulfate ion (-2).
Therefore, the formula is Li₂S₂O₈.
