Difference between revisions of "Beryllium"

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|melting-point = 1278 °C (1551 K)
 
|melting-point = 1278 °C (1551 K)
 
|boiling-point = 1317 °C (1590 K)
 
|boiling-point = 1317 °C (1590 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>
 
|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>
 
|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>
 
|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>
 
|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>
 
|thermo-ref = <ref name="NIST"/><ref>{{CODATA thermo}}.</ref>
 
|entropy = 9.50(8) J K<sup>−1</sup> mol<sup>−1</sup>
 
|entropy = 9.50(8) J K<sup>−1</sup> mol<sup>−1</sup>

Revision as of 18:37, 21 September 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)
Chemical properties[2]
Electronegativity 1.57 (Pauling)
Ionization energies[3]
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[4][5]
Covalent radius 96 pm
Ionic radius 27 pm (Be2+, Td)
Thermodynamic properties[1][6]
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[7]
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. Template:Allred (1961.
  3. 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>.
  4. 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.
  5. 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.
  6. 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>.
  7. 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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