Question

What is the valency of elements from 1-20 with reason

Answer 1

Answer:

Explanation:

Elements

Distribution of electrons Valence

electrons

Valency

K L M N

1

H 1 - - - 1 1

2

He 2 - - - 2 0

3

Li 2 1 - - 1 1

4

Be 2 2 - - 2 2

5

B 2 3 - - 3 3

6

C 2 4 - - 4 4

7

N 2 5 - - 5 8-5=3

8

O 2 6 - - 6 8-6=2

9

F 2 7 - - 7 8-7=1

10Ne 2 8 - - 8 0

11Na 2 8 1 - 1 1

12Mg 2 8 2 - 2 2

13Al 2 8 3 - 3 3

14Si 2 8 4 - 4 4

15P 2 8 5 - 5 8-5=3

16S 2 8 6 - 6 8-6=2

17Cl 2 8 7 - 7 8-7=1

18Ar 2 8 8 - 8 0

19K 2 8 8 1 1 1

20Ca 2 8 8 2 2 2