The element potassium(K) is in group I of Mendeleev's periodic table in which general formula is R2O. Similarly, the formula of oxide of potassium(K) is K2O
Element carbon(C) is in group IV of Mendeleev's periodic table. The general formula of oxide is R2O, and so the formula of oxide of carbon(C) is CO2.
Using the above way of finding oxides, the oxide of Al is Al2O3.
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