Boron, 5 boron (β-rhombohedral)
[ 1] नाँव के उच्चारण (BOHR -on एलोट्रोप α-, β-rhombohedral, β-tetragonal (and more ) रूपरंग black-brown स्टैंडर्ड परमाणु वजन (A r, standard ) [7001108059999999999♠ 10.8067001108210000000000♠ 10.8217001108100000000000♠ 10.81
परमाणु नंबर (Z ) 5 ग्रुप group 13 पीरियड 2 ब्लॉक p इलेक्ट्रान कन्फिगरेशन [He ] 2s2 2p1 Electrons per shell
2, 3 फेज at STP solid पघिलाव ताप 2349 K (2076 °C, 3769 °F) उबाल ताप 4200 K (3927 °C, 7101 °F) घनत्व जब लिक्विड होखे ( प.ता. ) 2.08 g/cm3 फ्यूजन के एन्थाल्पी 50.2 kJ/mol बास्पीकरण के एन्थाल्पी 508 kJ/mol मोलर हीट कैपसिटी 11.087 J/(mol·K) भाप दाब
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2348
2562
2822
3141
3545
4072
ऑक्सीडेशन स्टेट −5, −1, +1, +2, +3 [ 2] [ 3] acidic oxide) इलेक्ट्रोनिगेटिविटी Pauling scale: 2.04 आयनाइजेशन एनर्जी 1st: 800.6 kJ/mol 2nd: 2427.1 kJ/mol 3rd: 3659.7 kJ/mol (more ) एटॉमिक रेडियस empirical: 90 pm कोवैलेंट रेडियस 84±3 pm वान डर वाल्स रेडियस 192 pm क्रिस्टल स्ट्रक्चर rhombohedral Speed of sound thin rod 16,200 m/s (at 20 °C) थर्मल ऍक्सपैंशन β form: 5–7 µm/(m·K) (at 25 °C)[ 4] थर्मल कंडक्टिविटी 27.4 W/(m·K) इलेक्ट्रिकल रेजिस्टिविटी ~106 Ω·m (at 20 °C) चुंबकी क्रम diamagnetic [ 5] मोहो हार्डनेस ~9.5 सीएएस (CAS) नंबर 7440-42-8 खोज Joseph Louis Gay-Lussac and Louis Jacques Thénard [ 6] (30 June 1808) पहिला आइसोलेशन Humphry Davy [ 7] (9 July 1808)
10 B content may be as low as 19.1% and as high as 20.3% in natural samples. 11 B is the remainder in such cases.[ 9] |
बोरॉन एगो रासायनिक तत्व बाटे जेकर रसायनिक चिन्हा B बाटे आ परमानु अंक 5 बाटे।
↑ Van Setten et al. 2007, pp. 2460–1↑ 2.0 2.1 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 . उद्धरण खराबी:Invalid <ref> tag; name "v1" defined multiple times with different content ↑ Melanie Schroeder. "Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden" (PDF) (जर्मन में). 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 }}: CS1 maint: multiple names: authors list (link )↑ 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 . 68 : 169–174. {{cite journal }}: CS1 maint: multiple names: authors list (link )↑ 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 : 39–104. doi :10.1098/rstl.1809.0005 . ↑ 8.0 8.1 "Atomic Weights and Isotopic Compositions for All Elements" . National Institute of Standards and Technology. Retrieved 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 . ↑ Van Setten et al. 2007, pp. 2460–1↑ Conventional Atomic Weights 2013 . Commission on Isotopic Abundances and Atomic Weights ↑ Standard Atomic Weights 2013 . Commission on Isotopic Abundances and Atomic Weights ↑ Melanie Schroeder. "Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden" (PDF) (जर्मन में). p. 139.
