CHEM 1220 Chapter Notes - Chapter 21: Ionic Radius, Lead, Electron Affinity
9 Apr 2015
School
Department
Course
Professor
Document Summary
Chapter # 21: chemistry of main-group elements i: Periodic trends can be found in each group of elements in the periodic table. They have similar electronic configurations but not exactly the same chemical properties. Atomic properties that determine chemistry of element: (1) atomic radius (2) ionization energy (3) electron affinity (4) polarizability. Ionic radii p = (1. 60 x 10-19c)(z) (4/3) r3. The bond between metals and non-metals is ionic with a covalent character. Charge density (p) charge per unit volume in a cation. In a metallic bond, the higher the charge density of the cation, the greater its ability to distort the electron cloud around the anion. The greater the distortion of the electron cloud, the greater the covalent character of the bond. Alkali metals: z charge number r ionic radius relatively abundant on earth compounds were used since prehistoric times but elements were not isolated in pure form until about 200 years ago.
