Beryllium

Atomic properties
Atomic number	4
Standard atomic weight	9.012 182(3)
Electron configuration	1s2 2s2
Physical properties
Melting point	1278 °C (1551 K)
Boiling point	1317 °C (1590 K)
Ionization energies
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
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
GHS pictograms
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).
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lithium ← beryllium → boron

—
↑
Be
↓
Mg

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

Notes and references

↑ ^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).
↑ 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.
↑ 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>.
↑ 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.

See also the corresponding article on Wikipedia.

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