State ΔfH° ΔfG° S°

CpH H°298.15-H°0
Units kJ mol-1

kJ mol-1 J K-1 mol-1 J K-1 mol-1 kJ mol-1

Solid *0 0 *9.50 ± 0.08 16.4 *1.950 ± 0.020

Gas *324 ± 5 287 *136.275 ± 0.003 20.79 *6.197 ± 0.001

Notes

This tables gives a few thermodynamic data. Most values are those given in the NBS technical notes (reference 1) after conversion from the units used within those notes. Values labelled with an asterisk (*) are Committee on Data for Science and Technology (CODATA) agreed values for the thermodynamic properties of key chemical substances (reference 2). These values are published in a number of places including the WWW (reference 3).

References

R.H. Schumm, D.D. Wagman, S. Bailey, W.H. Evans, and V.B. Parker in National Bureau of Standards (USA) Technical Notes 270-1 to 270-8, 1973.
J.D. Cox, DD., Wagman, and V.A. Medvedev, CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, USA, 1989.
http://www.codata.org/resources/databases/key1.html

Beryllium (play /bəˈrɪliəm/ bə-RIL-ee-əm) is the chemical element with the symbol Be and atomic number 4.

A divalent element, beryllium is found naturally only combined with other elements in minerals. Notable gemstones which contain beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Because of its relatively high transparency to X-rays and other forms of ionizing radiation, beryllium also has a number of uses as filters and windows for radiation and particle physics experiments.

Commercial use of beryllium metal presents technical challenges due to the toxicity (especially by inhalation) of beryllium-containing dusts.

Beryllium produces a direct corrosive effect to tissue, and can cause a chronic life-threatening allergic disease called berylliosis in susceptible persons.

Because it is not synthesized in stars, beryllium is a relatively rare element in both the Earth and the universe. The element is not known to be necessary or useful for either plant or animal life.