Difference between revisions of "Boron"

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|atomic-weight = 10.811(7)
 
|atomic-weight = 10.811(7)
 
|configuration = 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>1</sup>
 
|configuration = 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>1</sup>
|phys-ref = <ref name="NIST">{{NIST chemistry | name = Boron | id = InChI=1S/B | accessdate = 2010-09-21}}.</ref>
+
|phys-ref = <ref name="NIST">{{NIST chemistry | name = Boron | id = InChI=1S/B | accessdate = 2010-09-21}}.</ref><ref name="G&E">{{Greenwood&Earnshaw1st|pages=155–242}}.</ref>
 
|melting-point = ''ca.'' 2300&nbsp;°C (2573&nbsp;K)
 
|melting-point = ''ca.'' 2300&nbsp;°C (2573&nbsp;K)
 
|boiling-point = ''ca.'' 2550&nbsp;°C (2823&nbsp;K)
 
|boiling-point = ''ca.'' 2550&nbsp;°C (2823&nbsp;K)
|chem-ref = <ref>{{Allred (1961)}}.</ref><ref name="G&E">{{Greenwood&Earnshaw1st|pages=155–242}}.</ref>
+
|density = 2.35 g cm<sup>−3</sup>
 +
|resistivity = 0.67 MΩ cm
 +
|chem-ref = <ref name="G&E"/><ref>{{Allred (1961)}}.</ref>
 
|electronegativity = 2.04 (Pauling)
 
|electronegativity = 2.04 (Pauling)
 
|solubility = insoluble
 
|solubility = insoluble

Revision as of 19:02, 21 September 2010

berylliumhydrogencarbon


H

Al
Atomic properties
Atomic number 5
Standard atomic weight 10.811(7)
Electron configuration 1s2 2s2 2p1
Physical properties[1][2]
Melting point ca. 2300 °C (2573 K)
Boiling point ca. 2550 °C (2823 K)
Density 2.35 g cm−3
Electric resistivity 0.67 MΩ cm
Chemical properties[2][3]
Electronegativity 2.04 (Pauling)
Solubility in water insoluble
Ionization energies[4][5][6]
1st 8.298 024(18) eV
800.6377(17) kJ mol−1
2nd 25.154 eV
2427.0 kJ mol−1
3rd 37.930 eV
3659.7 kJ mol−1
4th 259.368 eV
25025.2 kJ mol−1
5th 340.217 eV
32826.0 kJ mol−1
Total 670.967 eV
64738.5 kJ mol−1
Electron affinity[7]
0.279 743(44) eV
26.9910(42) kJ mol−1
Atomic radii[8]
Covalent radius 84 pm
Thermodynamic properties[1][9]
Standard entropy 5.90(8) J K−1 mol−1
Enthalpy change of atomization 565(5) kJ mol−1
Entropy change of atomization 147.54(8) J K−1 mol−1
Enthalpy change of fusion 48.93 kJ mol−1
Miscellaneous
CAS number 7440-42-8
EC number 231-151-2
Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

Boron (symbol: B) is a chemical element.

Notes and references

Notes

References

  1. 1.0 1.1 Boron. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3DInChI=1S/B>. (accessed 21 September 2010).
  2. 2.0 2.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 155–242. ISBN 0-08-022057-6.
  3. Allred, A. L. Electronegativity values from thermochemical data. J. Inorg. Nucl. Chem. 1961, 17 (3–4), 215–21. DOI: 10.1016/0022-1902(61)80142-5.
  4. Edlén, B.; Ölme, A.; Herzberg, G.; Johns, J. W. C. Ionization Potential of Boron, and the Isotopic and Fine Structure of 2s2p2 2D. J. Opt. Soc. Am. 1970, 60 (7), 889–91. DOI: 10.1364/JOSA.60.000889.
  5. Brown, C. M.; Tilford, S. G.; Ginter, M. L. Absorption spectrum of B I in the 1350–1900-Å region. J. Opt. Soc. Am. 1974, 64 (6), 877–79. DOI: 10.1364/JOSA.64.000877.
  6. 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>.
  7. Scheer, Michael; Bilodeau, René C.; Haugen, Harold K. Negative ion of boron: An experimental study of the 3P ground state. Phys. Rev. Lett. 1998, 80 (12), 2562–65. DOI: 10.1103/PhysRevLett.80.2562.
  8. 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.
  9. 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>.

External links

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