So that means because this has a lower energy, this is more stable than this cation. So once again, ionization energy is the energy required to take away an electron from a neutral, in this case, a neutral atom. So on my periodic table, the ionization energies are labeled with the green numerical value. So for example, for lithium, well, actually, let's take Beryllium. Beryllium requires 9.32
energy to take away this electron. And this energy goes in to this atom, forming this cation.