Why does reactivity increase going down a group on the periodic table?

All group 1 metals have one electron in its outer shell. As we go down the group, the atom gets bigger... Therefore, the attraction between the nucleus and the last electron gets weaker. This makes it easier for the atom to give up the electron which increases its reactivity.

Explanation:

jjj89t'ji; it hink the answer is your mom is not si

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter