Here's why:
* Lithium (Li): Lithium is a group 1 element, meaning it forms +1 ions (Li⁺).
* Hyposulphite (S₂O₄²⁻): This is the anion of hyposulfurous acid (H₂S₂O₄). It has a -2 charge.
To balance the charges, you need two lithium ions (2 x +1 = +2) to counter the -2 charge of the hyposulphite ion.
