Boron

Atomic properties
Atomic number	5
Standard atomic weight	10.811(7)
Electron configuration	1s2 2s2 2p1
Physical properties
Melting point	ca. 2300 °C
Boiling point	ca. 2550 °C
Chemical properties
Solubility in water	insoluble
Ionization energy
	8.298 024(18) eV; 800.6377(17) kJ mol−1
Thermodynamic properties
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
Miscellaneous
CAS number	7440-42-8
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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beryllium ← hydrogen → carbon

–
↑
H
↓
Al

Boron (symbol: B) is a chemical element.

Notes and references

↑ 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).
↑ 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>.
↑ 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>.

See also the corresponding article on Wikipedia.

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