Question

Predict the valency of the following elements:
1) A (atomic number 5)
2) B (atomic number 12)
3) C (atomic number 14)
4) D (atomic number 17)

Answer 1

A =3,b=2,c=4,d=1. This is the answer to the question

Answer 2

The valencies of the given compounds will be as follows:

1. A - Atomic number - 5 - element - Boron - Valency (2,3) - 3
2. B - Atomic number- 12 - element - Magnesium - Valency (2,8,2) - 2
3. C - Atomic number - 14 - element - Silicon - Valency(2,8,4) - 4
4. D - Atomic number - 17 - element - Chlorine - Valency(2,8,7) - (8-7=1) - 1

Thus, the valency of A, B, C, and D will be 3, 2, 4, and 1 respectively.