The document summarizes key concepts about the periodic table, including its history and development. It describes how Mendeleev organized the elements and made predictions that were later confirmed, establishing the periodic law. Over time, the periodic table was refined as new elements were discovered and atomic number was established as the basis for organization. The document also outlines periodic trends in properties like atomic radius, ionization energy, and electronegativity.

1. The Periodic Law Chapter 5

15. Electron Configurations and the Periodic Table Generally, the electron configuration of an atom’s highest occupied energy level governs that atom’s chemical properties!

35. Atomic Radii May be defined as ½ the distance between the nuclei of identical atoms that are bonded together.

38. Ionization Energy, IE The energy required to remove one electron from a neutral atom of an element.

43. Electron Affinity The energy change that occurs when an electron is acquired by a neutral atom.

47. Ionic Radii

53. Electronegativity A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound