SSC MTS EXAM

Detailed explanation-1: -The valencies of aluminium and chlorine in the compound AlCl3 respectively are 3, 1. Valency is the combining power of an element. The valency of an element is related to how many electrons are in the outer shell.

Detailed explanation-2: -The chlorine atom has 7 electrons in the outermost shell. Losing 7 electrons to obtain the stable electronic configuration is difficult. Instead chlorine gains one electron to achieve the octet state. Therefore, its valency is 1.

Detailed explanation-3: -Chlorine( ) has 7 electrons in the outermost shell which is greater than 4, hence the valency of chlorine( ) is 8-7 = 1 .

Detailed explanation-4: -The chlorine element belongs to group 17 because it has 7 valence electron . Its valency is 1 . It can gain one electron from any other atom to become stable. This means that it can never form a double or triple bond. Hence, we conclude that the valency of chlorine is 1 .