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CBSE Class 10 Answered

a. How does valency vary in a group on going from top to bottom? b. How does the number of valence electrons vary in a period on going from left to right and from top to bottom in a group?
Asked by Topperlearning User | 28 May, 2014, 08:36: AM
answered-by-expert Expert Answer

(a) Valency remains same on moving from top to bottom in a particular group. This is because the outermost electronic configuration of all the elements in a group remains same.

(b) On moving from left to right in a period, the number of valence electrons in elements increases from 1 to 8. The elements in a period have consecutive atomic numbers.

On moving down a group in the periodic table, the number of valence electrons in the elements remains the same.

Answered by | 28 May, 2014, 10:36: AM

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