1. Determine the charges of the ions:
* Potassium (K) is in Group 1 of the periodic table, so it forms a +1 cation (K⁺).
* Selenium (Se) is in Group 16 (VIA) of the periodic table, and typically forms a -2 anion (Se²⁻).
2. Balance the charges:
* To achieve a neutral compound, you need two potassium ions (2 x +1 = +2) to balance the charge of one selenium ion (-2).
3. Write the formula:
The formula for the ionic compound formed by potassium and selenium is K₂Se.
