This document defines and discusses several periodic properties including atomic and ionic radii, ionization energy, electron affinity, and electronegativity. It states that atomic radii decrease across a period and increase down a group due to the increasing nuclear charge and electron cloud size. Ionization energies increase across a period as it is harder to remove electrons that are closer to the nucleus, and decrease down a group as the electrons are farther away. Electron affinity and electronegativity generally increase across periods and decrease down groups due to the effective nuclear charge and electron distance from the nucleus. Valence electrons are the outermost electrons involved in bonding, with atoms seeking to obtain a full outer shell of 8 electrons.

3. Atomic Radii Section 2 Periodic Trends

5. Atomic Radii Section 2 Periodic Trends

7. Ionic Radii trends Section 2 Periodic Trends

13. Ionization Energy Section 2 Periodic Trends

22. Summary of periodic trends Section 2 Periodic Trends