Question

Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: 

K, C, Al, Si, Ba.

Answer 1

K is in group 1. Therefore, the oxide will be K₂O.

C is in group 4. Therefore, the oxide will be CO₂.

Al is in group 3. Therefore, the oxide will be Al₂O₃.

Si is in group 4. Therefore, the oxide will be SiO₂.

Ba is in group 2. Therefore, the oxide will be BaO.