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

Explanation

If the number of electrons in the outermost shell of the atom of an element is less than or equal to 4 then the valency of the element is equal to the number of electrons in the outermost, shell on the other hand, if the number of electrons in the outermost shell of the atom of an element is greater than 4, then the valency of that element is determined and subtracting the number of electrons in the outermost shell from 8. The distribution electrons in chlorine, sulphur and magnesium atoms are 2,8,7,2,8,6 and 2,8,2 respectively.
`therefore` The number of electrons in the outermost shell of chlorine, sulphur and magnesium atoms are 7,6 and 2 respectively.
● Thus the valency of chlorine `= 8-7=1`
● The valency of sulphur `= 8-6=2`
● The valency of magnesium = 2