11. How will, you find the valency of chlorine, sulphur and magnesium?

The valency of an element is defined as its combining power with other atoms when it forms chemical compounds or molecules. It is measured by finding the number of electrons needed to complete the shell in which it is present or the excess electrons present after the filling is complete. Chlorine : Atomic number = 17 Number of protons = Number of electrons = 17 Distribution : K " 2; L " 8; M " 7 From the above observation, it is noticed that its valency is 1. Sulphur : Atomic number = 16 Number of protons = Number of electrons = 16 Distribution : K " 2; L " 8; M " 6 From the above observation, it is noticed that its valency is two. Magnesium : Atomic number = 12 Number of protons = Number of electrons = 12 Distribution : K " 2; L " 8; M " 2 From the above observation, it is noticed that its valency is two.