Question

Why is fluorine the most reactive non-metal and the most electronegative atom?

Answer 1

The reason is due to its smaller size and valency.
Fluorine has the smallest size among the halogens and hence has higher electro negativity value as due to smaller size the nuclear charge is stronger.
Fluorine has valency of one hence it will surely try its best to get one electron to attain the nearest noble gas configuration and get stable and hence its is so reactive.

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Answer 2

Hey mate !!

Here's your answer !!

We know that as we go down a group in the periodic table the reactivity decreases and electro positivity increases.

Since Fluorine is at the first period in group 17, the reactivity is larger and the electro positivity is lower.

Hence it is the most reactive non metal and most electro negative atom.

Hope my answer helped !!

Cheers !!