ଛାଞ୍ଚ:Infobox boron

ଉଇକିପିଡ଼ିଆ ରୁ

| colspan=2 style="text-align: center" | Main article: Isotopes of boron

Boron
5B
-

B

Al
berylliumboroncarbon
ଭୌତିକ ରୁପ
black-brown
ସାଧାରଣ ଧର୍ମ
ନାମ, ପ୍ରତୀକ,
ପରମାଣୁ କ୍ରମାଙ୍କ
boron, B,
5
ଉଚ୍ଚାରଣ /ˈbɔərɒn/
ମୌଳିକ ପ୍ରକାର metalloid
ଶ୍ରେଣୀ, ପର୍ଯ୍ୟାୟ, ବ୍ଲକ୍ 13, 2, p
ମାନକ ପରମାଣବିକ ଓଜନ 10.81(1)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ [He] 2s2 2p1
2, 3
Electron shells of boron (2, 3)
ଇତିହାସ
ଆବିଷ୍କାର Joseph Louis Gay-Lussac and Louis Jacques Thénard[୧] (30 June 1808)
First isolation Humphry Davy[୨] (9 July 1808)
ଭୌତିକ ଧର୍ମ
ଅବସ୍ଥା solid
Liquid density at m.p. 2.08 g·cm−3
ଗଳନାଙ୍କ 2349 K, 2076 °C, 3769 °F
ସ୍ଫୁଟନାଙ୍କ 4200 K, 3927 °C, 7101 °F
Heat of fusion 50.2 kJ·mol−1
Heat of vaporization 480 kJ·mol−1
Molar heat capacity 11.087 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2348 2562 2822 3141 3545 4072
Atomic properties
Oxidation states 3, 2, 1[୩]
(mildly acidic oxide)
Electronegativity 2.04 (Pauling scale)
Ionization energies
(more)
1st: 800.6 kJ·mol−1
2nd: 2427.1 kJ·mol−1
3rd: 3659.7 kJ·mol−1
Atomic radius 90 pm
Covalent radius 84±3 pm
Van der Waals radius 192 pm
Miscellanea
Crystal structure rhombohedral
Magnetic ordering diamagnetic[୪]
Electrical resistivity (20 °C) ~106 Ω·m
Thermal conductivity 27.4 W·m−1·K−1
Thermal expansion (25 °C) (β form) 5–7[୫] µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 16,200 m·s−1
Mohs hardness ~9.5
CAS registry number 7440-42-8
Most stable isotopes
iso NA half-life DM DE (MeV) DP
10B 19.9(7)%* 10B is stable with 5 neutrons[୬]
11B 80.1(7)%* 11B is stable with 6 neutrons[୬]
*Boron-10 content may be as low as 19.1% and as
high as 20.3% in natural samples. Boron-11 is
the remainder in such cases.
[୭]
· r

References

These references will appear in the article, but this list appears only on this page.
  1. Gay Lussac, J.L. and Thenard, L.J. (1808) "Sur la décomposition et la recomposition de l'acide boracique," Annales de chimie [later: Annales de chemie et de physique], vol. 68, pp. 169–174.
  2. Davy H (1809). "An account of some new analytical researches on the nature of certain bodies, particularly the alkalies, phosphorus, sulphur, carbonaceous matter, and the acids hitherto undecomposed: with some general observations on chemical theory". Philosophical Transactions of the Royal Society of London 99: 33–104. 
  3. Zhang, K.Q.; Guo, B.; Braun, V.; Dulick, M.; Bernath, P.F. (1995). "Infrared Emission Spectroscopy of BF and AIF". J. Molecular Spectroscopy 170: 82. Bibcode:1995JMoSp.170...82Z. doi:10.1006/jmsp.1995.1058. 
  4. Lide, David R. (ed.) (2000). Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics. CRC press. ISBN 0849304814. 
  5. Holcombe Jr., C. E.; Smith, D. D.; Lorc, J. D.; Duerlesen, W. K.; Carpenter; D. A. (October 1973). "Physical-Chemical Properties of beta-Rhombohedral Boron". High Temp. Sci. 5 (5): 349–57. 
  6. ୬.୦ ୬.୧ "Atomic Weights and Isotopic Compositions for All Elements". National Institute of Standards and Technology. http://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl. Retrieved 2008-09-21. 
  7. Szegedi, S.; Váradi, M.; Buczkó, Cs. M.; Várnagy, M.; Sztaricskai, T. (1990). "Determination of boron in glass by neutron transmission method". Journal of Radioanalytical and Nuclear Chemistry Letters 146 (3): 177. doi:10.1007/BF02165219.