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# 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.
• .
collectively we have the formulae for the oxides of the following elements as :
1. K → $$K_2O$$.
2. C→ $$CO_2$$
3. Al → $$Al_2O_3$$
4. Si → $$SiO_2$$
5. Ba → $$BaO$$