1) How does the number of a) valence electrons b) valency vary on moving from left to right in the second period of the periodic table
 
 
2) Fluorine, Chlorine and Bromine are put in one group on the basis of their similar properties.
     a) which are those similar properties.
 
 3) which elements are placed at extreme right of the periodic table:?

Asked by Tun Tun | 15th Apr, 2017, 12:00: PM

Expert Answer:

Dear tuntunpallab@gmail.com

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Answer to your first query is stated below:

(a)On moving from left to right, the valence increases from 1 to 4 and then decreases from 4 to 0.

(b)With respect to second period, 1 electron starts adding to the last shell on moving from left to right. Hence the number of valence electrons increases as follows.

Li(1) Be(2) B(3) C(4) N(5) O(6) F(7) Ne(8)

Therefore, the valency increases as given below:

Li(1) Be(2) B(3) C(4) N(3) O(2) F(1)


Regards

Topperlearning Team.

Answered by Vaibhav Chavan | 15th Apr, 2017, 12:28: PM