why Fluorine is more reactive in the group of halogens?
Answers
Reactivity is an elements ability to gain an electron...
The thing that makes fluorine so reactive is its electronegativity. ...
Therefore, since fluorine has a higher electronegatvity than chlorine, fluorine is more reactive
Chlorine is less reactive than fluorine because the outer electrons in a chlorine atom are further from the nucleus than the outer electrons in a fluorine atom. It is harder for a chlorine atom to gain an electron than it is for a fluorine atom.
Larger atoms = less reactive
As you go down Group 7 the atoms become larger, and the highest occupied energy level (the outer shell) becomes further from the nucleus. The force of attraction between the positively-charged nucleus and a negatively-charged electron from another atom becomes weaker.
As a result, it becomes harder to attract and gain an electron the larger the atom becomes. The more difficult it is to gain these outer electrons, the less reactive a halogen is.
I hope this is your answer.