Question

compare And control the arrangement of elements in mendleev periodic table and mosley's modern periodic table( any five) give me a proper answer please​

Answer 1

Explanation:

Oxygen is a member of group VI A 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.

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

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

(iii) Aluminium (Al) belongs to groups III A and its valency is 3. The formula of its oxide is Al2O3.

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

(v) Barium (Ba) belongs to group II A and the valency of the element is 2. The formula of the oxide of the element is