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Boron | |||||||||||||||
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Pronunciation | /ˈbɔːrɒn/ | ||||||||||||||
രൂപാന്തരങ്ങൾ | α-, β-rhombohedral, β-tetragonal (and more) | ||||||||||||||
Appearance | black-brown | ||||||||||||||
Boron ആവർത്തനപ്പട്ടികയിൽ | |||||||||||||||
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ഗ്രൂപ്പ് | group 13 (boron group) | ||||||||||||||
പിരീഡ് | period 2 | ||||||||||||||
ബ്ലോക്ക് | p-block | ||||||||||||||
ഇലക്ട്രോൺ വിന്യാസം | [He] 2s2 2p1 | ||||||||||||||
Electrons per shell | 2, 3 | ||||||||||||||
Physical properties | |||||||||||||||
Phase at STP | solid | ||||||||||||||
ദ്രവണാങ്കം | 2349 K (2076 °C, 3769 °F) | ||||||||||||||
ക്വഥനാങ്കം | 4200 K (3927 °C, 7101 °F) | ||||||||||||||
Density when liquid (at m.p.) | 2.08 g/cm3 | ||||||||||||||
ദ്രവീകരണ ലീനതാപം | 50.2 kJ/mol | ||||||||||||||
Heat of vaporization | 508 kJ/mol | ||||||||||||||
Molar heat capacity | 11.087 J/(mol·K) | ||||||||||||||
Vapor pressure
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Atomic properties | |||||||||||||||
Oxidation states | −5, −1, +1, +2, +3[2][3] (a mildly acidic oxide) | ||||||||||||||
Electronegativity | Pauling scale: 2.04 | ||||||||||||||
അയോണീകരണ ഊർജം |
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ആറ്റോമിക ആരം | empirical: 90 pm | ||||||||||||||
കൊവാലന്റ് റേഡിയസ് | 84±3 pm | ||||||||||||||
Van der Waals radius | 192 pm | ||||||||||||||
Spectral lines of boron | |||||||||||||||
Other properties | |||||||||||||||
Natural occurrence | primordial | ||||||||||||||
ക്രിസ്റ്റൽ ഘടന | rhombohedral | ||||||||||||||
Speed of sound thin rod | 16,200 m/s (at 20 °C) | ||||||||||||||
Thermal expansion | β form: 5–7 µm/(m⋅K) (at 25 °C)[4] | ||||||||||||||
താപചാലകത | 27.4 W/(m⋅K) | ||||||||||||||
Electrical resistivity | ~106 Ω⋅m (at 20 °C) | ||||||||||||||
കാന്തികത | diamagnetic[5] | ||||||||||||||
കാന്തികക്ഷമത | −6.7·10−6 cm3/mol[5] | ||||||||||||||
Mohs hardness | ~9.5 | ||||||||||||||
സി.എ.എസ് നമ്പർ | 7440-42-8 | ||||||||||||||
History | |||||||||||||||
Discovery | Joseph Louis Gay-Lussac and Louis Jacques Thénard[6] (30 June 1808) | ||||||||||||||
First isolation | Humphry Davy[7] (9 July 1808) | ||||||||||||||
Isotopes of boron | |||||||||||||||
Template:infobox boron isotopes does not exist | |||||||||||||||
B · Boron | ||
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→ H | ||
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indexes by PT (page) |
Data sets read by {{Infobox element}} | |
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Name and identifiers | |
Top image | |
image caption | |
image alt | |
Pronunciation | |
Category (enwiki) | |
Standard atomic weight | |
most stable isotope | |
Oxidation states | |
Spectral lines image |
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