Bórọ̀nù

Bórọ̀nù ni ẹ́límẹ̀ntì kẹ́míkà kan tó ní àmì-ìdámọ̀ B àti nọ́mbà átọ̀mù 5. Nítorípé bórọ̀nù jẹ́ dídá pátápátá pẹ̀lu ìtúká ìrànká kọ́smíkì tí kò sì jẹ́ pẹ̀lù núkléùkíkódájọpọ̀ oníràwọ̀, kò fi bẹ́ẹ̀ pọ̀ ní inú sístẹ́mù òrùn àti nínú ìgbẹ́lẹ̀ Ayé. Bórọ̀nù wọ́jọ ní Ayé pẹ̀lu ìtúsómi àwọn àdàpọ̀ rẹ̀ tí wọ́n wọ́pọ̀, èyun ùn àwọn àlùmọ́nì bóràtì. Àwọn wọ̀nyí únjẹ́ wíwà láti inú ilẹ̀ ní ilé-iṣẹ́ gẹ́gẹ́bí ìṣágbẹ, bíi bóráksì àti kẹ́rnítì.

Bórọ̀nù, ₅B

boron (β-rhombohedral)
Bórọ̀nù
Pípè	/ˈbɔːrɒn/ ​(BOR-on)
Ìhànsójú	black-brown
Ìwúwo átọ̀mù Ar, std(B)	[10.806, 10.821] conventional: 10.81
Bórọ̀nù ní orí tábìlì àyè
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson - ↑ B ↓ Al bẹ́rílíọ̀mù ← bórọ̀nù → carbon
Nọ́mbà átọ̀mù (Z)	5
Ẹgbẹ́	group 13 (boron group)
Àyè	àyè 2
Àdìpọ̀	Àdìpọ̀-p
Ẹ̀ka ẹ́límẹ́ntì	Metalloid
Ìtò ẹ̀lẹ́ktrọ́nù	[He] 2s2 2p1
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 3
Àwọn ohun ìní ara
Ìfarahàn at STP	aláralíle
Ìgbà ìyọ́	2349 K ​(2076 °C, ​3769 °F)
Ígbà ìhó	4200 K ​(3927 °C, ​7101 °F)
Kíki when liquid (at m.p.)	2.08 g/cm3
Heat of fusion	50.2 kJ/mol
Heat of	480 kJ/mol
Molar heat capacity	11.087 J/(mol·K)
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	−5, −1, 0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 2.04
energies	(more)
Atomic radius	empirical: 90 pm
Covalent radius	84±3 pm
Van der Waals radius	192 pm
Spectral lines of bórọ̀nù
Other properties
Natural occurrence	primordial
Crystal structure	​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)
Thermal conductivity	27.4 W/(m·K)
Electrical resistivity	~106  Ω·m (at 20 °C)
Magnetic ordering	diamagnetic
Mohs hardness	~9.5
CAS Number	7440-42-8
History
Discovery	Joseph Louis Gay-Lussac and Louis Jacques Thénard (30 June 1808)
First isolation	Humphry Davy (9 July 1808)
Main isotopes of bórọ̀nù
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 10B 19.9(7)%* 10B is stable with 5 neutrons 11B 80.1(7)%* 11B is stable with 6 neutrons
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.

Bórọ̀nù

Bórọ̀nú, tó jẹ́ títòpọ̀ mọ́ ẹgbẹ́ mẹ́tálọ́ìdì, tí kò darapọ̀ bíi kẹ́míkà kò sí ní Ilé-Ayé. Ní ilé-iṣẹ́, ó ṣòro látí dá bórọ̀nù ògidì nítorípé oúndá èròjà míràn tí wọ́n ní kárbọ́nù tàbí àwọn ẹ́límẹ̀ntí míràn díẹ̀ nínú. Orísi àwọn àllótrópù bórọ̀nù lówà: bórọ̀nù amorphous boron is a brown powder and crystalline boron is black, extremely hard (about 9.5 on the Mohs scale), and a poor conductor at room temperature. Elemental boron is used as a dopant in the semiconductor industry.