CHEM 1030 Lecture : Periodic Properties of the Elements

• School: Auburn University
• Department: Chemistry
• Course: CHEM 1030
• Professor: Marla Spergel

Document Summary

Periodic trends: rationalize observed trends in: Development of periodic table: elements in the same group generally have similar chemical properties; physical properties are not necessarily similar, dmitri mendeleev and lothar meyer independently came to the same conclusion about how elements should be grouped. In a many-electron atom, electrons are both attracted to the nucleus and repelled by other electrons: the nuclear charge that an electron experiences depends on both factors, the effective nuclear charge, zeff, is found this way: Where z is the atomic number and s is a screening constant, usually close to the number of inner electrons. Sizes of atoms: the bonding atomic radius is defined as one-half of the distance between covalently bonded nuclei, bonding atomic radius tends to . Decrease from left to right across a row (due to increasing zeff). Increase from top to bottom of a column (due to increasing value of n).