Boron, 5 B boron (β-rhombohedral)
[1] Bigkas sa Ingles / / (BOR -on ) Alotropiya α-, β-rhombohedral, β-tetragonal (and more ) Hitsura black-brown Pamantayang atomikong timbang A r °(B) [ 10.806 , 10.821 ] 10.81± 0.02 (pinaikli)[2]
Atomikong bilang (Z ) 5 Pangkat pangkat 13 (grupong boro) Peryodo peryodo 2 Bloke p-blokeKonpigurasyon ng elektron [He ] 2s2 2p1 Mga elektron bawat kapa 2, 3 Pase sa STP solid Punto ng pagkatunaw 2349 K (2076 °C, 3769 °F) Punto ng pagkulo 4200 K (3927 °C, 7101 °F) Densidad kapag likido (sa m.p. ) 2.08 g/cm3 Init ng pusyon 50.2 kJ/mol Init ng baporisasyon 480 kJ/mol Molar na kapasidad ng init 11.087 J/(mol·K) Presyon ng singaw
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2348
2562
2822
3141
3545
4072
Mga estado ng oksidasyon −5, −1, 0,[3] +1, +2, +3 [4] [5] (isang katamtamang asidikong oksido) Elektronegatibidad Eskala ni Pauling: 2.04 Mga enerhiyang ionisasyon Radyong atomiko emperiko: 90 pm Radyong Kobalente 84±3 pm Radyong Van der Waals 192 pm Mga linyang espektral ng boron Likas na paglitaw primordiyal Kayarian ng krystal rhombohedral Bilis ng tunog manipis na bara 16,200 m/s (at 20 °C) Termal na pagpapalawak (β form) 5–7[6] µm/(m⋅K) (at 25 °C) Termal na konduktibidad 27.4 W/(m⋅K) Elektrikal na resistibidad ~106 Ω⋅m (at 20 °C) Magnetikong pagsasaayos diamagnetic [7] Eskala ni Mohs sa katigasan ~9.5 Bilang ng CAS 7440-42-8 Pagkakatuklas Joseph Louis Gay-Lussac and Louis Jacques Thénard [8] (30 June 1808) Unang pagbubukod Humphry Davy [9] (9 July 1808)
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. [11]
Kategorya: Boron
B:
in
calc from C
diff
report
ref
C
2076
—
—
K
2349
2349
0
F
3769
3769
0
max precision
0
WD
2077 2077 Celsius
input
C: 2076, K: 2349, F: 3769
comment
B:
in
calc from C
diff
report
ref
C
3927
—
—
K
4200
4200
0
F
7101
7101
0
max precision
0
WD
4000 4000 Celsius
input
C: 3927, K: 4200, F: 7101
comment
Talababa
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↑ Van Setten et al. 2007, pp. 2460–1
↑ "Standard Atomic Weights: Boron" . CIAAW . 2009.
↑ Braunschweig, H.; Dewhurst, R. D.; Hammond, K.; Mies, J.; Radacki, K.; Vargas, A. (2012). "Ambient-Temperature Isolation of a Compound with a Boron-Boron Triple Bond". Science . 336 (6087): 1420–2. Bibcode :2012Sci...336.1420B . doi :10.1126/science.1221138 . PMID 22700924 . S2CID 206540959 .
↑ Zhang, K.Q.; Guo, B.; Braun, V.; Dulick, M.; Bernath, P.F. (1995). "Infrared Emission Spectroscopy of BF and AIF" (PDF) . J. Molecular Spectroscopy . 170 (1): 82. Bibcode :1995JMoSp.170...82Z . doi :10.1006/jmsp.1995.1058 .
↑ Melanie Schroeder. Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden (PDF) (sa Aleman). p. 139.
↑ 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. {{cite journal }}
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↑ Lide, David R. (ed.) (2000). Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF) . CRC press. ISBN 0849304814 .
↑ 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.
↑ 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.
↑ 10.0 10.1 "Atomic Weights and Isotopic Compositions for All Elements" . National Institute of Standards and Technology. Nakuha noong 2008-09-21 .
↑ 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 .
↑ Zhang, K.Q.; Guo, B.; Braun, V.; Dulick, M.; Bernath, P.F. (1995). "Infrared Emission Spectroscopy of BF and AIF" (PDF) . J. Molecular Spectroscopy . 170 : 82. Bibcode :1995JMoSp.170...82Z . doi :10.1006/jmsp.1995.1058 . {{cite journal }}
: CS1 maint: multiple names: mga may-akda (link )