What other information can you get about elements from the periodic table

What other information can you get about elements from the periodic table

1 atomic radius (1) except the first cycle, the atomic radius of other periodic elements (except inert gas elements) decreases with the increase of atomic number; (2) The atomic radius of the elements of the same family increases with the increase of the number of electron layers from top to bottom. 2 the valence of the elements (1) in addition to the first cycle, the same cycle from left to