Question

Use Mendeleev's Periodic Table to predict the formula of oxides of potassium, aluminum, and barium.

Answer 1

K is in Group 1. So, the oxide will be K₂O (Potassium oxide).

Al is in Group 3. So, the oxide will be Al₂O₃ (Aluminium oxide).

Ba is in Group 2. So, the oxide will be BaO (Barium oxide).