Difference between revisions of "Boron"
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{{Infobox element | {{Infobox element | ||
| − | |name = | + | |name = boron |
| − | |symbol = | + | |symbol = B |
|left = [[beryllium]] | |left = [[beryllium]] | ||
|right = [[carbon]] | |right = [[carbon]] | ||
| Line 8: | Line 8: | ||
|atomic-number = 5 | |atomic-number = 5 | ||
|atomic-weight = 10.811(7) | |atomic-weight = 10.811(7) | ||
| − | |configuration = | + | |configuration = [He] 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 °C (2573 K) | |melting-point = ''ca.'' 2300 °C (2573 K) | ||
|boiling-point = ''ca.'' 2550 °C (2823 K) | |boiling-point = ''ca.'' 2550 °C (2823 K) | ||
| − | | | + | |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 | ||
| Line 24: | Line 26: | ||
|EA-ref = <ref>{{citation | last1 = Scheer | first1 = Michael | last2 = Bilodeau | first2 = René C. | last3 = Haugen | first3 = Harold K. | title = Negative ion of boron: An experimental study of the <sup>3</sup>''P'' ground state | journal = Phys. Rev. Lett. | year = 1998 | volume = 80 | issue = 12 | pages = 2562–65 | doi = 10.1103/PhysRevLett.80.2562}}.</ref> | |EA-ref = <ref>{{citation | last1 = Scheer | first1 = Michael | last2 = Bilodeau | first2 = René C. | last3 = Haugen | first3 = Harold K. | title = Negative ion of boron: An experimental study of the <sup>3</sup>''P'' ground state | journal = Phys. Rev. Lett. | year = 1998 | volume = 80 | issue = 12 | pages = 2562–65 | doi = 10.1103/PhysRevLett.80.2562}}.</ref> | ||
|EA1 = 0.279 743(44) eV<br/>26.9910(42) kJ mol<sup>−1</sup> | |EA1 = 0.279 743(44) eV<br/>26.9910(42) kJ mol<sup>−1</sup> | ||
| − | |radius-ref = <ref>{{Cordero et al. (2008)}}.</ref> | + | |radius-ref = <ref>{{Cordero et al. (2008)}}.</ref><ref>{{Shannon (1976)}}.</ref> |
|covalent-radius = 84 pm | |covalent-radius = 84 pm | ||
| + | |ionic-radius = 25 pm (B<sup>3+</sup>, ''T<sub>d</sub>'')<br/>41 pm (B<sup>3+</sup>, ''O<sub>h</sub>'') | ||
|thermo-ref = <ref name="NIST"/><ref>{{CODATA thermo}}.</ref> | |thermo-ref = <ref name="NIST"/><ref>{{CODATA thermo}}.</ref> | ||
|entropy = 5.90(8) J K<sup>−1</sup> mol<sup>−1</sup> | |entropy = 5.90(8) J K<sup>−1</sup> mol<sup>−1</sup> | ||
Latest revision as of 10:11, 27 December 2010
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Boron (symbol: B) is a chemical element.
Notes and references
Notes
References
- ↑ 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).
- ↑ 2.0 2.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 155–242. ISBN 0-08-022057-6.
- ↑ 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.
- ↑ 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.
- ↑ 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.
- ↑ 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>.
- ↑ 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.
- ↑ 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>.
External links
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See also the corresponding article on Wikipedia. |
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