how will you find the valency of chlorine, sulphur and magnesium?
Answers
Answer:
If the number of electrons in the outermost shell of an atom of an element is less than or equal to 4, then the valency of an element is equal to the number of electrons in the outermost shell.
If it is greater than 4 then, the valance is determined by subtracting the outermost shell of electrons from 8.
The electrons in Cl, S, and Mg are 2,8,7 ; 2,8,6 ; 2,8,2
Hence the valency of Cl, S, and Mg are 1, 2, 2 respectively.
Answer: hope it helps you to understand
1. 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.
2. 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.
3. 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 recognized as valency. As magnesium has 2 valence electrons, its valency is 2.