The Periodic Table has more trends than just the similarities in properties of elements in each column. Other trends are present like atomic radius, ionization energy, eletron affinity, and electronegativity. As can be seen in the image there are many trends on the periodic table.
Atomic radius is the distance between the outter most electrons and the nucleus. Since the farther down you get on the periodic table the more energy levels are present in the atom, there is a tendency as you move down and to the left on the periodic table to have a higher atomic radius.
Ionization energy is the amount of energy to remove the outter most electron of an atom. When this happens the atom becomes an ion and is positively charged. As you get closer to the top right the more energy you need to remove the outter most electron resulting in a higher ionization energy.
Electron affinity is the amount of energy when an electron joins onto an atom. Electron affinity is not as clear as ionization energy but as you go to the top right of the periodic table electron affinitiy increases.
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