Question

What is the similarity in the electronic structure of Litium, Sodium ,Pottasium. Which of the above elements are most reactive and why?

Answer 1

So potassium is more reactive than lithium because the outer electron of a potassium atom is further from its nucleus than the outer electron of a lithium atom. Francium atoms, with 7 shells, are the largest atoms in Group 1. They are very reactive - now you know why.