Question

what is valency? write the valency of chlorine ​

Answer 1

Answer:

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

The atomic number of chlorine is 17 and the electronic configuration is 2, 8, 7. Therefore, the valency of chlorine is 1.

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Answer 2

Valency is capacity of elements to gain or loose electrons to complete it's octet state. For example :-atomic no. of oxygen is 8 & it's electronic configuration is 2,6. For octet state an atom needs 8 electrons in its outer shell bt oxygen has only 6. Hence valency of oxygen id 6-8 = -2.

Valency of chlorine is -1.