Question

Explain the following: Fluorine is most reactive of all the four common halogens.

Answer 1

Flourine has a total of 9 electrons, 2 in the first and 7 in the second.
Those 7 electrons are tightly bound to the nucleus because they are so close. The atom has a very strong affinity ( degree in which a substance will bind to something) to get the missing 8th electron needed to have a full shell.
So it will jump at the chance to make a covalent bond with any atom that will share an electron.
The bond it makes is likewise very strong.
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Answer 2

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1. Fluorine has the electronic configuration

( 2, 7 ).

2. It requires only one electron to complete the octet.

3. The atomic size of fluorine is the smallest among the halogens.

4. Hence, the nuclear attraction on the outermost electrons is maximum.

Hence, fluorine is the most reactive among the halogens.

Hope it helps!

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