CBSE Class 10CBSE
Share
Notifications

View all notifications

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 Electron in X? (B) What is the Valency of X? (C) What is the Number of Valence Electrons in Y? (D) What is the Valency of Y? Explain How You Have Arrived at Your Answers. - CBSE Class 10 - Science

Login
Create free account


      Forgot password?

Question

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 electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.

Solution

(a) The number of valence electrons in element X is 2 because this element belongs to group 2.

(b) The valency of the group 2 element X is 2.

(c) Valence electrons of group 15:
Group number = Valence electrons + 10
                 15 = Valence electrons + 10
Valence electrons = 15 - 10 = 5           

(d) Valency of the group 15 element Y is 3, that is, (8 - 5).

  Is there an error in this question or solution?

APPEARS IN

 Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 5: Periodic Classification Of Elements
Q: 22 | Page no. 303
Solution 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 Electron in X? (B) What is the Valency of X? (C) What is the Number of Valence Electrons in Y? (D) What is the Valency of Y? Explain How You Have Arrived at Your Answers. Concept: Position of Elements and Trends in the Modern Periodic Table.
S
View in app×