Boron

Boron, ₅B
	boron (β-rhombohedral)
Boron
Bigkas	/ˈbɔːrɒn/ (BOR-on)
Allotropes	α-, β-rhombohedral, β-tetragonal (at marami pa)
Appearance	black-brown
Standard atomic weight Ar°(B)
	[10.806, 10.821]; 10.81±0.02 (pinaikli);
Boron sa talahanayang peryodiko
	beryllium ← boron → carbon
Atomikong bilang (Z)	5
Group	13
Period	2
Block	p-block
Electron configuration	[He] 2s2 2p1
Electrons per shell	2, 3
Physical properties
Phase at STP	solido
Melting point	2349 K (2076 °C, 3769 °F)
Boiling point	4200 K (3927 °C, 7101 °F)
Density when liquid (at m.p.)	2.08 g/cm3
Heat of fusion	50.2 kJ/mol
Heat of vaporization	508 kJ/mol
Molar heat capacity	11.087 J/(mol·K)
Atomic properties
Oxidation states	−5, −1, 0, +1, +2, +3 (isang katamtamang asidikong oksido)
Electronegativity	Pauling scale: 2.04
Ionization energies	1st: 800.6 kJ/mol ; 2nd: 2427.1 kJ/mol ; 3rd: 3659.7 kJ/mol ; (more) ;
Atomic radius	empirical: 90 pm
Covalent radius	84±3 pm
Van der Waals radius	192 pm
	Mga linyang espektral ng boron
Other properties
Natural occurrence	primordiyal
Crystal structure	rhombohedral
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
Molar magnetic susceptibility	−6.7×10−6 cm3/mol
Speed of sound thin rod	16,200 m/s (at 20 °C)
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)
Isotopes of boron t; b;
	Kategorya: Boron; tingnan; usapan; baguhin; \| references

Ang boro (Ingles: boron) ay isang elementong kimikal sa talahanayang peryodiko na sinasagisag ng simbolong B at nagtataglay ng atomikong bilang 5.

May atomikong bigat na 10.118, punto ng pagkatunaw na 2,300oC, nagkakaroon ng sublimasyon sa 2,550oC, may espesipikong grabidad na 2.34 (anyong kristalina), at balensiyang 3) ay isang hindi metalikong elemento na malambot at kakulay ng kape, at nasa anyong amorpus o kristalina. Nakukuha ang mga ito mula sa kerito at boraks. Naihiwalay ito nina Humphry Davy, Joseph Louis Gay-Lussac at Louis Jacques Thénard^[11] noong 1808 sa pamamagitan ng reaksiyon ng asidong boriko at ng potasyo. Tinawag ito ni Davy bilang boracium.^[12] Nagagamit ang elementong ito para sa paggawa ng mga pampasibad na kemikal, sa mga pampailaw, panggasgas, at maging para sa aloy na matitigas.^[11]

Mga sanggunian

↑ Van Setten et al. 2007, pp. 2460–1
↑ "Standard Atomic Weights: Boron" (sa wikang Ingles). CIAAW. 2009.
↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (sa wikang Ingles). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
↑ 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 (sa wikang Ingles). 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 (sa wikang Ingles). 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 wikang Ingles). 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.
↑ ^8.0 ^8.1 Haynes, William M., pat. (2016). CRC Handbook of Chemistry and Physics (ika-97th (na) edisyon). CRC Press. p. 4.127. ISBN 9781498754293.
↑ Gay Lussac, J.L.; Thenard, L.J. (1808). "Sur la décomposition et la recomposition de l'acide boracique". Annales de chimie. 68: 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: 39–104. doi:10.1098/rstl.1809.0005.
↑ ^11.0 ^11.1 Gaboy, Luciano L. Boron - Gabby's Dictionary: Praktikal na Talahuluganang Ingles-Filipino ni Gabby/Gabby's Practical English-Filipino Dictionary, GabbyDictionary.com.
↑ Weeks, Mary Elvira (1933). "XII. Other Elements Isolated with the Aid of Potassium and Sodium: Beryllium, Boron, Silicon and Aluminum". The Discovery of the Elements. Easton, PA: Journal of Chemical Education. ISBN 0-7661-3872-0.

[1] Van Setten et al. 2007, pp. 2460–1

[2] "Standard Atomic Weights: Boron" (sa wikang Ingles). CIAAW. 2009.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (sa wikang Ingles). doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[4] 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 (sa wikang Ingles). 336 (6087): 1420–2. Bibcode:2012Sci...336.1420B. doi:10.1126/science.1221138. PMID 22700924. S2CID 206540959.

[5] Zhang, K.Q.; Guo, B.; Braun, V.; Dulick, M.; Bernath, P.F. (1995). "Infrared Emission Spectroscopy of BF and AIF" (PDF). J. Molecular Spectroscopy (sa wikang Ingles). 170 (1): 82. Bibcode:1995JMoSp.170...82Z. doi:10.1006/jmsp.1995.1058.

[6] Melanie Schroeder. Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden (PDF) (sa wikang Ingles). p. 139.

[7] 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.

[crc97-8] 8.0 ^8.1 Haynes, William M., pat. (2016). CRC Handbook of Chemistry and Physics (ika-97th (na) edisyon). CRC Press. p. 4.127. ISBN 9781498754293.

[Lussac-9] Gay Lussac, J.L.; Thenard, L.J. (1808). "Sur la décomposition et la recomposition de l'acide boracique". Annales de chimie. 68: 169–174.

[Davy-10] 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.

[Gaboy-11] 11.0 ^11.1 Gaboy, Luciano L. Boron - Gabby's Dictionary: Praktikal na Talahuluganang Ingles-Filipino ni Gabby/Gabby's Practical English-Filipino Dictionary, GabbyDictionary.com.

[weeks-12] Weeks, Mary Elvira (1933). "XII. Other Elements Isolated with the Aid of Potassium and Sodium: Beryllium, Boron, Silicon and Aluminum". The Discovery of the Elements. Easton, PA: Journal of Chemical Education. ISBN 0-7661-3872-0.

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