Bor (B)

chemical element with symbol B and atomic number 5

Atomic Number	5
Atomic Weight	10.81
Rhif màs	11

Group	13
Period	2
Block	p

Proton	5 p⁺
Niwtron	6 n⁰
Electron	5 e^-

Nodwedd Ffisegol

Atomic Radius	85 pm 205 pm
molar volume	4.6 cm³/mol
covalent radius	85 pm 78 pm 73 pm 84 pm
Metallic Radius	80 pm 98 pm
ionic radius	1 pm 11 pm 27 pm
Crystal Radius	15 pm 25 pm 41 pm
Van der Waals radius	180 pm 402 pm 192 pm 215 pm 192 pm 408.3 pm
density	2.34 g/cm³ 2,080 kg/m³

Nodwedd Gemegol

egni

proton affinity
electron affinity	0.279723 eV/particle
ionization energy	8.298019 eV/particle 25.15483 eV/particle 37.93058 eV/particle 259.3715 eV/particle 340.226008 eV/particle

enthalpy of vaporization	504.5 kJ/mol
enthalpy of fusion	23.6 kJ/mol
standard enthalpy of formation	565 kJ/mol
Electron

plisgyn yr electron	2, 3

valence electron	3 ⓘ

trefn yr electronnau	[He] 2s² 2p¹ⓘ 1s² 2s² 2p¹

Cyflwr ocsidiad	-5, -1, 0, 1, 2, 3
Electronegatifedd	12.13 eV/particle 0.184886 2.04
Electrophilicity Index	1.1470276511768214 eV/particle
cyflwr sylfaenol mater

cyflwr mater	Solid
gaseous state of matter
Boiling Point	4,273.15 K
Melting Point	2,350.15 K
critical pressure
critical temperature
triple point
appearance
lliw	Black #00ff00 #ffb5b5 #ffb5b5
appearance	black-brown
Mynegrif plygiant
nodwedd ffisegol gwrthrych
Thermal Conductivity	27.4 W/(m K)
thermal expansion	0.000006 1/K
molar heat capacity	11.087 J/(mol K)
Specific Heat Capacity	1.026 J/(g⋅K)
heat capacity ratio
electrical properties
type	Insulator
dargludedd trydanol	0.0000000001 MS/m
Gwrthedd	10,000 Ω*m
superconductivity
magnetism
type	diamagnetic
magnetic susceptibility (Mass)	-0.0000000087 m³/Kg
magnetic susceptibility (Molar)	-0.0000000000941 m³/mol
magnetic susceptibility (Volume)	-0.0000214
magnetic ordering
Curie temperature
Néel temperature
strwythur
Crystal Structure	Simple Trigonal (TET)
lattice constant	8.73 Å
Lattice Angles	1.01334, 1.01334, 1.01334
nodwedd mecanyddol deunyddiau
hardness	9.3 MPa 49,000 MPa
bulk modulus	320 GPa
shear modulus
Young's modulus
Poisson's ratio
speed of sound	16,200 m/s
classification
Category	Metalloids, Metalloids
CAS Group	IIIB
IUPAC Group	IIIA
Glawe Number	86
Mendeleev Number	81
Pettifor Number	86
Geochemical Class
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	20.5 ± 0.1 a₀
C6 Dispersion Coefficient	99.5 a₀ 99.2 a₀
allotrope	Alpha Rhombohedral Boron, Beta Rhombohedral Boron, Alpha Tetragonal Boron
Neutron cross section	760
Neutron Mass Absorption	2.4
quantum number	2P1/2
space group	166 (R_3m)

Isotopes of Boron

Stable Isotopes	2
Unstable Isotopes	14
Natural Isotopes	2

⁶B

Rhif màs	6
neutron number	1
Relative Atomic Mass	6.0508 ± 0.00215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	2
nuclear quadrupole moment
dyddiad darganfod
parity	-

decay mode	intensity
2p (2-proton emission)

⁷B

Rhif màs	7
neutron number	2
Relative Atomic Mass	7.029712 ± 0.000027 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	570 ± 14 ys
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1967
parity	-

decay mode	intensity
p (proton emission)	100%

⁸B

Rhif màs	8
neutron number	3
Relative Atomic Mass	8.024607315 ± 0.000001073 Da
g-factor	0.51775 ± 0.00015
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	771.9 ± 0.9 ms
spin	2
nuclear quadrupole moment	0.0643 ± 0.0014
dyddiad darganfod	1950
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺α (β⁺-delayed α emission)	100%

⁹B

Rhif màs	9
neutron number	4
Relative Atomic Mass	9.013329645 ± 0.000000969 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	800 ± 300 zs
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1940
parity	-

decay mode	intensity
p (proton emission)	100%

¹⁰B

Rhif màs	10
neutron number	5
Relative Atomic Mass	10.012936862 ± 0.000000016 Da
g-factor	0.60015453333333 ± 0.00000026666666666667
natural abundance	19.65 ± 0.44
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	3
nuclear quadrupole moment	0.0846 ± 0.0002
dyddiad darganfod	1920
parity	+

¹¹B

Rhif màs	11
neutron number	6
Relative Atomic Mass	11.009305166 ± 0.000000013 Da
g-factor	1.792252 ± 0.00000066666666666667
natural abundance	80.35 ± 0.44
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	0.04059 ± 0.0001
dyddiad darganfod	1920
parity	-

¹²B

Rhif màs	12
neutron number	7
Relative Atomic Mass	12.014352638 ± 0.000001418 Da
g-factor	1.003 ± 0.001
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	20.2 ± 0.02 ms
spin	1
nuclear quadrupole moment	0.0132 ± 0.0003
dyddiad darganfod	1935
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻α (β⁻-delayed α emission)	0.6%

¹³B

Rhif màs	13
neutron number	8
Relative Atomic Mass	13.017779981 ± 0.000001073 Da
g-factor	2.1185333333333 ± 0.00033333333333333
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	17.16 ± 0.18 ms
spin	3/2
nuclear quadrupole moment	0.0365 ± 0.0008
dyddiad darganfod	1956
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.266%

¹⁴B

Rhif màs	14
neutron number	9
Relative Atomic Mass	14.02540401 ± 0.000022773 Da
g-factor	0.5925 ± 0.0025
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	12.36 ± 0.29 ms
spin	2
nuclear quadrupole moment	0.0297 ± 0.0008
dyddiad darganfod	1966
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	6.04%
2n (2-neutron emission)

¹⁵B

Rhif màs	15
neutron number	10
Relative Atomic Mass	15.031087023 ± 0.000022575 Da
g-factor	1.7726666666667 ± 0.01
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	10.18 ± 0.35 ms
spin	3/2
nuclear quadrupole moment	0.0379 ± 0.0011
dyddiad darganfod	1966
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	98.7%
2n (2-neutron emission)	1.5%

¹⁶B

Rhif màs	16
neutron number	11
Relative Atomic Mass	16.039841045 ± 0.000026373 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	2000
parity	-

decay mode	intensity
n (neutron emission)

¹⁷B

Rhif màs	17
neutron number	12
Relative Atomic Mass	17.046931399 ± 0.000219114 Da
g-factor	1.7 ± 0.013333333333333
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	5.08 ± 0.05 ms
spin	3/2
nuclear quadrupole moment	0.0385 ± 0.0015
dyddiad darganfod	1973
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	63%
2n (2-neutron emission)	12%
3n (3-neutron emission)	3.5%
4n	0.4%

¹⁸B

Rhif màs	18
neutron number	13
Relative Atomic Mass	18.055601683 ± 0.00021918 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	2
nuclear quadrupole moment
dyddiad darganfod	2010
parity	-

decay mode	intensity
n (neutron emission)	100%

¹⁹B

Rhif màs	19
neutron number	14
Relative Atomic Mass	19.064166 ± 0.000564 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2.92 ± 0.13 ms
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1984
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	71%
2n (2-neutron emission)	17%
3n (3-neutron emission)	9.1%

²⁰B

Rhif màs	20
neutron number	15
Relative Atomic Mass	20.074505644 ± 0.000586538 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	1
nuclear quadrupole moment
dyddiad darganfod	2018
parity	-

decay mode	intensity
n (neutron emission)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

²¹B

Rhif màs	21
neutron number	16
Relative Atomic Mass	21.084147485 ± 0.00059975 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	2018
parity	-

decay mode	intensity
2n (2-neutron emission)	100%

hanes

darganfyddwr neu ddyfeisiwr	Sir H. Davy, J.L. Gay-Lussac, L.J. Thénard
man darganfod	England/France
dyddiad darganfod	1808
geirdarddiad	From Arabic and Persian words for borax.
ynganiad	BO-ron (Saesneg)

source

Abundance
Abundance in Earth's crust	10 mg/kg
natural abundance (cefnfor)	4.44 mg/L
natural abundance (corff dynol)	0.00007 %
natural abundance (Awyrfaen)	0.00016 %
natural abundance (Haul)	0.0000002 %
Abundance in Universe	0.0000001 %

Nuclear Screening Constants

1	s	0.3205
2	p	2.5786
2	s	2.4238

Bor on ChemicalAid

AGROVOC ID	c_1018
Australian Educational Vocabulary ID	scot/2755
Brockhaus Enzyklopädie online ID	bor-30
ChEBI ID	27560
ChemSpider ID	4575371
DSSTOX compound identifier	DTXCID503922
DSSTox substance ID	DTXSID3023922
Dynodwr Drugbank (Alberta)	11203
ECHA Substance Infocard ID	100.028.319
French Vikidia ID	Bore
GND	4007709-3
Great Russian Encyclopedia Online ID	1878022
InChI	InChI=1S/B
InChIKey	ZOXJGFHDIHLPTG-UHFFFAOYSA-N
Italian Vikidia ID	Boro
Latvian National Encyclopedia Online ID	89038
Mindat mineral ID	43412
NDF-RT	N0000148267
Namuwiki ID	붕소
National Library of Israel J9U ID	987007283095205171
OmegaWiki Defined Meaning	420
OpenAlex ID	C501308230
Pixiv Encyclopedia ID	ホウ素
Probes And Drugs ID	PD143904
PubChem CID	5462311
Rhif Cofrestru CAS	7440-42-8
RxNorm ID	1705
Spanish Vikidia ID	Boro
Store norske leksikon ID	bor_-_grunnstoff
UMLS CUI	C0006030
UNII	N9E3X5056Q
USGS Thesaurus ID	1412
WordNet 3.1 Synset ID	14656049-n
ZVG number	8030
dynodwr AAT	300264228
dynodwr BnF	12140810z
dynodwr Encyclopædia Britannica Online	science/boron-chemical-element
dynodwr Encyclopædia Universalis	bore
dynodwr Freebase	/m/025svlc
dynodwr Gran Enciclopèdia Catalana	0085405
dynodwr HSDB	4482
dynodwr KBpedia	Boron
dynodwr KEGG	C06266
dynodwr LCAuth	sh85015871
dynodwr Llyfrgell Genedlaethol Latfia	000310483
dynodwr MeSH	D001895
dynodwr NDL	00563492
dynodwr NKC	ph118964
dynodwr PSH	5791
dynodwr Quora	Boron
dynodwr Treccani	boro
dynodwr YSO	7591
dynodwr thesawrws Senedd y DU	8744
dynodwr yn thesawrws y BNCF	31249

Bor (B)

Nodwedd Ffisegol

Nodwedd Gemegol

other

Isotopes of Boron

6B

7B

8B

9B

10B

11B

12B

13B

14B

15B

16B

17B

18B

19B

20B

21B

hanes

source

Nuclear Screening Constants

⁶B

⁷B

⁸B

⁹B

¹⁰B

¹¹B

¹²B

¹³B

¹⁴B

¹⁵B

¹⁶B

¹⁷B

¹⁸B

¹⁹B

²⁰B

²¹B