Question

Why fluorine has high negative electron gain enthalpy?

Answer 1

Explanation:

because of the tendency of every element to complete the octate (or duet)

Answer 2

Answer:

because fluorine has a very small atom in which shells containing electrons are very near to nucleus which contains protons. As these protons are positively charged and r near to the shells ,so it can easily attract electrons and therefore, fluorine has high affinity for electrons