Difference between revisions of "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)
Chemical properties
Electronegativity	1.57 (Pauling)
Ionization energies
1st	9.322 6277(13) eV; 895.064 89(12) 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
Atomic radii
Covalent radius	96 pm
Ionic radius	27 pm (Be2+, Td)
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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Revision as of 17:37, 21 September 2010

lithium ← beryllium → boron

—
↑
Be
↓
Mg

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

↑ ^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).
↑ Template:Allred (1961.
↑ Moore, Charlotte E. Ionization potentials and ionization limits derived from the analyses of optical spectra. Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.) 1970, 34, 1–22, <http://www.nist.gov/data/nsrds/NSRDS-NBS34.pdf>.
↑ Cordero, Beatriz; Gómez, Verónica; Platero-Prats, Ana E.; Revés, Marc; Echeverría, Jorge; Cremades, Eduard; Barragán, Flavia; Alvarez, Santiago Covalent radii revisited. Dalton Trans. 2008 (5), 2832–38. DOI: 10.1039/b801115j.
↑ Shannon, R. D. Revised effective ionic radii and systematic studies of interatomic distances in halids and chalcogenides. Acta Crystallogr. A 1976, 32 (5), 751–67. DOI: 10.1107/S0567739476001551.
↑ 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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@@ Line 12: / Line 12: @@
 |melting-point = 1278&nbsp;°C (1551&nbsp;K)
 |boiling-point = 1317&nbsp;°C (1590&nbsp;K)
-|IE-ref = <ref>{{RubberBible62nd|page=E-65}}.</ref>
+|chem-ref = <ref>{{Allred (1961}}.</ref>
-|IE1 = 9.322 eV<br/>899.44 kJ mol<sup>−1</sup>
+|electronegativity = 1.57 (Pauling)
+|IE-ref = <ref>{{NSRDS-NBS 34}}.</ref>
+|IE1 = 9.322 6277(13)  eV<br/>895.064 89(12) kJ mol<sup>−1</sup>
 |IE2 = 18.211 eV<br/>1757.1 kJ mol<sup>−1</sup>
 |IE3 = 153.893 eV<br/>14 848.4 kJ mol<sup>−1</sup>
 |IE4 = 217.713 ev<br/>21 006.1 kJ mol<sup>−1</sup>
 |IE-total = 399.139 eV<br/>38 511.1 kJ mol<sup>−1</sup>
+|radius-ref = <ref>{{Cordero et al. (2008)}}.</ref><ref>{{Shannon (1976)}}.</ref>
+|covalent-radius = 96 pm
+|ionic-radius = 27 pm (Be<sup>2+</sup>, ''T<sub>d</sub>'')
 |thermo-ref = <ref name="NIST"/><ref>{{CODATA thermo}}.</ref>
 |entropy = 9.50(8) J K<sup>−1</sup> mol<sup>−1</sup>