Question

Fluorine has less bond energy than chlorine and bromine.Why??????​

Answer 1

Explanation:

size factor.

small size causes repulsion force (larger than I2 or Br2 having longer bond lengths) between non-bonding electron clouds of two atoms. it reduces the bond stability, hence, decreases the bond energy.

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hope, it helps you.

Answer 2

size of fluorine is very small so its F-F Bond length is very short therefore its electrons are lies very close to each other due to which repulsion take place which weakened the bond energy of flourine