Question

How does the valency vary in a period on going from left to right?

Answer 1

The valency of the elements in a period first increases from 1 to 4 and then decreases to zero.The tendency to lose an electron decreases in going left to right.

Answer 2

In period from left to right, the valency initially increases for first four elements of the period and then decreases till the end.

• The number of electron present on the outermost orbit of the element is called valence electron.
• For elements which has valence electron less than 4 in such cases:

Valency = Valence electron

• On the other hand in case of elements which has valence electron more than 4 in such cases:

Valency = 8- valence electron.

• Accordingly when the elements of period 2 are analyzed, their valency are as follows:

1. Lithium: Valence electron = 1, Valency =1
2. Beryllium: Valence electron = 2, Valency = 2
3. Boron: Valence electron = 3, Valency = 3
4. Carbon: Valence electron = 4, Valency = 4
5. Nitrogen: Valence electron = 5, Valency = (8-5)=3
6. Oxygen: Valence electron = 6, Valency = (8-6) = 2
7. Fluorine: Valence electron = 7, Valency = (8-7) = 1
8. Neon: Valence electron = 8, Valency = (8-8) = 0

• The order of valency in period 2 elements are 1,2,3,4,3,2,1,0.

• Thus form the above give data it can be inferred that the valency increases for first four element, and then decreases till the end in a period on going from left to right.

Learn more about Valency

Workout with the formula of a compound formed between phosphorus and oxygen.

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Valency of an element A is 3 and that of element B is 2 . write the formula of a compound formed by combination of A and B

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