Question

Why is chlorine a very reactive non metal

Answer 1

Chlorine atoms have a lot of valance electrons without being complete on its own, so it has a greater need to seek it's conjugates. That's called Electronegativity. Halogens are highly reactive because of their electronegativity.

Answer 2

chlorine possesses 7 electrons in the outermost shell and it only required 1 electron to complete its octet

so it react easily

other factors like bond length, ionizisation etc are also responsible for that

it is not copied it is based on my knowledge according to my standard

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