Question

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

Answer 1

• 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.
• Oxide of Si is SiO2.
• The oxide of Ba is BaO.