Difference between revisions of "Beryllium"

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Revision as of 14:38, 20 June 2010

lithiumberylliumboron


Be

Mg
Atomic properties
Atomic number 4
Standard atomic weight 9.012 182(3)
Electron configuration 1s2 2s2
Physical properties[1]
Melting point 1278 °C (1551 K)
Boiling point 1317 °C (1590 K)
Ionization energies[2]
1st 9.322 eV
899.44 kJ mol−1
2nd 18.211 eV
1757.1 kJ mol−1
3rd 153.893 eV
14 848.4 kJ mol−1
4th 217.713 ev
21 006.1 kJ mol−1
Total 399.139 eV
38 511.1 kJ mol−1
Thermodynamic properties[1][3]
Standard entropy 9.50(8) J K−1 mol−1
Enthalpy change of atomization 324(5) kJ mol−1
Entropy change of atomization 136.275(3) J K−1 mol−1
Enthalpy change of fusion 15.51 kJ mol−1
Hazards[4]
GHS pictograms Acte Tox. 2, Acute Tox. 3Carc. 1B, STOT RE 1, STOT SE 3, Skin Sens. 1, Eye Irrit. 2, Skin Irrit. 2
GHS signal word DANGER
GHS hazard statements H350, H330, H301, H372, H319, H335, H315, H317
Miscellaneous
CAS number 7440-41-7
EC number 231-150-7
Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

Beryllium (symbol: Be) is a chemical element, the lightest of the alkaline earth metals.

Notes and references

Notes

References

  1. 1.0 1.1 Beryllium. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/Be>. (accessed 20 June 2010).
  2. CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p E-65. ISBN 0-8493-0462-8.
  3. Cox, J. D.; Wagman, D. D.; Medvedev, V. A. CODATA Key Values for Thermodynamics; Hemisphere: New York, 1989. ISBN 0891167587, <http://www.codata.org/resources/databases/key1.html>.
  4. Index no. 004-001-00-7 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 340.

External links

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