How will you find the valency of chlorine, sulphur and magnesium?
Answers
Answer:
Valency of chlorine:
The atomic number of chlorine is 17
The electronic configuration of chlorine is [Ne]3s2 3p5or can also be written as 2,8,7.
This shows chlorine has 7 valence electrons in its outermost shell.
If the valence electron is more than 4, then the valency can be calculated as follows: Valency = Valence electron -8
Accordingly, the valency of chlorine is 7-8 which is -1.
Valency of sulphur:
The atomic number of sulphur is 16
The electronic configuration of sulfur is (S) [Ne] 3s1 .
So in order to achieve stability, sulfur has to gain 2 electrons.
The valency of sulphur = 8 – 6 = 2
Therefore, the valency of sulphur is 2.
Valency of magnesium:
The atomic number of magnesium is 12
The electronic configuration of magnesium is [Ne]3s2 or can also be written as 2,8,2.
This shows magnesium has 2 valence electrons in its outermost shell.
If the valence electron is less than 4, it is recognised as valency.
As magnesium has 2 valence electrons, its valency is 2.
Therefore, the valency of chlorine, sulphur and magnesium is 1, 2 and 2 respectively.