The nature of chemicals follows a somewhat repeated pattern. Just as a sine or cosine
funciton repeats itself continuously. For a sine or cosine function, the time it takes for
the function to start repeating itself is called a period. Early chemists found that chemicals
behave similarly according to thier atomic number, or number of protons. PERIODIC
PROPERITIES are chemical and physical properties which repeat themselves regularly as
you go down a group or across a period.
Here is a link for Dr Witt's CHM 110 CLASS Environmental Chemistry.com
PERIODIC TABLES
CHEMGLOBE
WEB ELEMENTS
LOS ALAMOS NATIONAL LAB
CHEMYSTRY
YOGI'S PERIODIC TABLE
HYPERCHEMISTRY
CHEMICOOL
DAYAH'S TABLE
MOKEUR'S INTERACTIVE TABLE
SGTL CHEMICAL CALCULATOR
PICTORIAL PERIODIC TABLE with links
Periodic Table links
COMIC BOOK PERIODIC TABLE
CHEMISTRY LINKS
ABOUT.COM CHEMISTRY
LOOKSMART CHEMISTRY
CHEM TEACHER TOOLS
OTHER LINKS