Question

Why are elements with a higher EN the least reaction and elements with a lower EN the most reactive

Answer 1

By EN you mean electronegativity?

Answer 2

yup

Answer 3

Hmm...well, more electronegative = more reactive from what I can recall. It has to do with the tendency of an atom and acquire electrons from other atoms..

Answer 4

Elements, such as fluorine, which have high electronegativity values will be very reactive. Similarly, those with low ionization energ (electropositive) with also be reactive