Question

7. An element X belongs to group 2 and another
element Y belongs to group 15 of the periodic
table:
(a) What is the number of valence electrons in X?
(b) What is the valency of X?
(c) What is the number of valency electrons in Y?
(d) What is the valency of Y?
​

Answer 1

(a) 2

(b) 2

(c) 5

(d) 3

These are your answers.

Answer 2

The number of valence electrons in X are 2.

The valency of X is 2.

The number of valency electrons in Y are 5.

The valency of Y is 3.

Explanation:

• Valence electrons are defined as the electrons present in the outermost shell of an element. When an element is present in group 2 then it means it contains 2 valence electrons.

• Therefore, there are 2 valence electrons present in element X. And, valency of element X is also 2.

• And, an element present in group 15 will have electronic distribution as 2, 8, 5. This means that there are 5 valence electrons present in element Y. Valency of element Y is 3.

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