Question

Chlorine is an active non metal why?

Answer 1

Chlorine have valence number of electron = 7

so, it can gain 1 electron to complete its octets.

so, It is active non metal.

Answer 2

Explanation:

The electronic configuration of chlorine is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$. As there are only five electrons in 3p sub shell therefore, in order to obtain stability, chlorine requires to gain only one electron.

Therefore, it will react readily with another element who can transfer or share one electron. That is why, chlorine is an active non-metal.