Question

Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:(i) the number of valence electrons in their atoms(ii) their valencies(iii) metallic character(iv) the sizes of their atoms(v) the formulae of their oxides
(vi) the formulae of their chlorides

Answer 1

1. The element in group 2 will have 1 more electron than the element in group 1.
2. Valency of element in group 2 is 1 more than that of the element in the group 1.
3. Element in group 2 is less metallic in nature.
4. Element in group 1 is bigger in size than the element in group 2.
5. In Group 1: X2O and in Group 2:XO.
6. In Group 1:XCl and in Group 2:XCl2.

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Answer 2

Answer:

Explanation:

(a)

X is in Group 17, period 3

Y is in group 2 Period 4.

(b)

X is non-metal

Y is metal

(c) Y Oxide will be basic in nature. The compound is formed by an ionic bond.

Metallic oxides are basic in nature because they react with dilute acids to form salt and water. Group 1 & 2 oxides are highly alkaline in nature that is why group 1 is called alkaline metals and group 2 is called Alkaline Earth metals.