Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements : K, C, Al, Si, Ba.

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.
.

1. K → \( K_2O \).
2. C→ \( CO_2 \)
3. Al → \(Al_2O_3 \)
4. Si → \( SiO_2 \)
5. Ba → \( BaO \)