This is the home page of WebElements, the periodic table (periodic chart) of the elements on the World-Wide Web. Find information about elements such as hydrogen, copper, gold, and uranium here.

NIST Standard Reference Database Number 69 - February 2000 Release. This site provides thermochemical, thermophysical, and ion energetics data compiled by NIST under the Standard Reference Data Program.

THERMODYNAMIC DATA AT 298 K The GRI-Mech thermochemistry is based upon standard databases, including the NASA-Lewis and Technion archives. This was supplemented by a critical review of the standard enthalpies of formation for radical species. Clicking on the species symbols in the following summary table will bring up a full table of the molar heat capacity, entropy and standard enthalpy of ...