Periodic Trends?

Question

Why does the reactivity of non-metals decrease as you move down a group/family? and why is flourine the most reactive?

Answer 1

Nonmetals decrease in reactivity as you go down the group because of additional electron levels around the atoms. The additional levels make the valence electrons farther from the nucleus so they feel less attraction to the nucleus. The larger the diameter of the atom the lower the attraction for the valence electrons and electrons from other atoms.

Nonmetals tend to gain electrons in chemical reactions. The attraction an atom has for shared electrons is called electronegativity. The greater the attraction the greater the electronegativity. This property decreases as you go down the group.

Since the attraction for the outer electrons decreases as you go down the group, the reactivity of the nonmetals decreases as you go down the group.

Answer 2

it's not only when you move down it's when you move down and to the left that they decrease