What is the pattern of the property as you look from top to bottom in inonization?

As you move down a group in the Periodic Table, the ionization energy generally decreases. This trend occurs because the outer electrons are farther from the nucleus, leading to a weaker electrostatic attraction and making it easier to remove an electron. Additionally, increased electron shielding from inner electrons also contributes to this reduction in ionization energy. Consequently, elements lower in a group tend to form cations more readily than those higher up.