question_answer 11)

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

Answer:

Valency of an atom is the number of electrons gained, lost or shared so as to complete the octet of electrons in the valence shell. Valency of chloride: It has electronic configuration = 2, 8, 7                                 Thus, one electron is gained to complete its octet and so its valency is 1. Valency of sulphur: Its has electronic configuration = 2, 8, 6 Thus, 2 electrons are gained to complete its octet and hence its valency = 2 Valency of magnesium : It has electronic configuration = 2, 8, 2 Thus, it can lose two electrons to attain octet and hence its valency = 2