Other contributors have said "More reactive lithium or barium?" is the same question as "Which element is more reactive lithium Li or barium Ba?" If you believe that these are not asking the same thing and should be answered differently, click here
Which element is more reactive lithium Li or barium Ba?
Lithium is wayy more reactive... like, duh? An elements reactivity depends on its ionisation energy (the amount of energy required to remove one electron from the atom) and if you look at a periodic...