Question

(xii) The elements X and Y have valen-
cies 5 and 3 and 3 and 2 respec- 1
tively. The elements X and Y are
more likely be respectively
(a) sulphur and iron
(b) copper and sulphur
(c) nitrogen and iron
(d) phosphorous and nitrogen
(​

Answer 1

Answer:

phosphorus and Nitrogen

Answer 2

Answer:

OPTION D

Explanation:

Based on the electronic configuration and group number the elements valency are decided.  

For ex.,

Alkali metal - Group I has 1 valence electron

Alkaline earth metal - Group II has 2 valence electron

Boron group - 13 group has 3 valence electron

Carbon group - 14 group has 4 valence electron

Nitrogen group- 15 group has 3 and 5 valence electron

Oxygen group - 16 group has 2 valence electron

Halogen group- 17 group has 1 valence electron

Inert gases - 18 group has 0 valence electron

Element X has valence electron 3 and 5. So it belongs to Nitrogen group.  

Element Y - valence electron are 3 and 2. So it belongs to d block  element.

Element X is nitrogen

Element Y is iron

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