The general formula for oxides of 1st, 2nd, 3rd and 4th group are \(R_2O, RO, R_2O_3 and RO_2 \) respectively in the Mendeleev’s Periodic Table, where R denotes the element.
Here we have:
- Potassium (K) belongs to the 1st group so, the formula of its oxide will be \( K_2O \).
Barium (Ba) belongs to the 2nd group, so the formula of its oxide would be BaO.
Aluminium (Al) belongs to the 3rd group, so the formula of its oxide would be \(Al_2O_3 \)
Carbon (C) and Silicon (Si) belong to the 4th group,so the formula of its oxide would be \( CO_2 and SiO_2 \) respectively.
collectively we have the formulae for the oxides of the following elements as :
- K → \( K_2O \).
- C→ \( CO_2 \)
- Al → \(Al_2O_3 \)
- Si → \( SiO_2 \)
- Ba → \( BaO \)