Question

Predict the formula for the oxides of the following elements: Si,K,Ba,Al,Ca using Mendeleev’s periodic table

Answer 1

According to Dmitri Ivanovich Mendeleev's periodic table the formula for the oxides will be:-
Si - SiO2
K - K2O
Ba - BaO
Al - Al2O3
Ca - CaO

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Answer 2

Answer:

Oxygen is a member of group VIA in Mendeleev’s periodic table. Its valency is 2. Similarly, the valencies of all the elements listed can be predicted from their respective groups. This can help in writing the formulae of their oxides.

Potassium (K) is a member of group IA. Its valency is 1. Therefore, the formula of its oxide is K2O.

Carbon (C) is a member of group IVA. Its valency is 4. Therefore, the formula of its oxide is C2O4 or CO2.

Aluminium (Al) belongs to groups IIIA and its valency is 3. The formula of the oxide of the element is Al2O3.

Silicon (Si) is present in group IVA after carbon. Its valency is also 4. The formula of its oxide is Si2O4 or SiO2.

Barium (Ba) belongs to group IIA and the valency of the element is 2. The formula of the oxide of the element is Ba2O2 or BaO.