Boron

Boron (B)

chemical element with symbol B and atomic number 5
Atomic Number5
Atomic Weight10.81
Hejmara baristeyî11
Group13
Period2
Blockp
Proton5 p+
Notron6 n0
Kareva5 e-
Animated Bohr model of B (Boron)

Physical Property

Atomic Radius
85 pm
molar volume
Covalent Radius
85 pm
Metallic Radius
80 pm
ionic radius
1 pm
Crystal Radius
15 pm
Van der Waals radius
192 pm
density
2,34 g/cm³
Atomic Radii Of The Elements: Boron0102030405060708090100110120130140150160170180190200pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

wize
proton affinity
electron affinity
0,279723 eV/particle
ionization energy
8,298019 eV/particle
ionization energy of B (Boron)
enthalpy of vaporization
504,5 kJ/mol
enthalpy of fusion
23,6 kJ/mol
standard enthalpy of formation
565 kJ/mol
Kareva
electron shell2, 3
Bohr model: B (Boron)
valence electron3
Lewis structure: B (Boron)
electron configuration[He] 2s2 2p1
1s2 2s2 2p1
Enhanced Bohr model of B (Boron)
Orbital Diagram of B (Boron)
oxidation number-5, -1, 0, 1, 2, 3
electronegativity
2.04
Electrophilicity Index
1,1470276511768214 eV/particle
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
4.273,15 K
Melting Point
2.350,15 K
critical pressure
critical temperature
triple point
appearance
color
Black
appearanceblack-brown
refractive index
thermodynamic material property
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
typeInsulator
electrical conductivity
0,0000000001 MS/m
electrical resistivity
10.000 m Ω
superconductivity
magnetism
typediamagnetic
magnetic susceptibility (Mass)
-0,0000000087 m³/Kg
magnetic susceptibility (Molar)
-0,0000000000941 m³/mol
magnetic susceptibility (Volume)
-0,0000214
magnetic ordering
Germahiya Curie
Néel temperature
pêkhate
Crystal StructureSimple Trigonal (TET)
lattice constant
8,73 Å
Lattice Angles1.01334, 1.01334, 1.01334
mechanical property
hardness
9,3 MPa
bulk modulus
320 GPa
shear modulus
Young's modulus
Poisson's ratio
Leza dengê
16.200 m/s
classification
CategoryMetalloids, Metalloids
CAS GroupIIIB
IUPAC GroupIIIA
Glawe Number86
Mendeleev Number81
Pettifor Number86
Geochemical Class
Goldschmidt classificationlitophile

other

Gas Basicity
polarizability
20,5 ± 0,1 a₀
C6 Dispersion Coefficient
99,5 a₀
allotropeAlpha Rhombohedral Boron, Beta Rhombohedral Boron, Alpha Tetragonal Boron
Neutron cross section
760
Neutron Mass Absorption
2,4
quantum number2P1/2
space group166 (R_3m)

Isotopes of Boron

Stable Isotopes2
Unstable Isotopes14
Natural Isotopes2
Isotopic Composition1180.35%1180.35%1019.65%1019.65%

6B

Hejmara baristeyî6
neutron number1
Giraniya atomê
6,0508 ± 0,00215 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin2
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity-

decay modeintensity
2p (2-proton emission)

7B

Hejmara baristeyî7
neutron number2
Giraniya atomê
7,029712 ± 0,000027 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
570 ± 14 ys
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1967
parity-

decay modeintensity
p (proton emission)100%

8B

Hejmara baristeyî8
neutron number3
Giraniya atomê
8,024607315 ± 0,000001073 Da
g-factor
0,51775 ± 0,00015
natural abundance
radioactivity☢️ radioactive element
half-life
771,9 ± 0,9 ms
spin2
nuclear quadrupole moment
0,0643 ± 0,0014
dema îcadkirinê yan keşfê1950
parity+

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

9B

Hejmara baristeyî9
neutron number4
Giraniya atomê
9,013329645 ± 0,000000969 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
800 ± 300 zs
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1940
parity-

decay modeintensity
p (proton emission)100%

10B

Hejmara baristeyî10
neutron number5
Giraniya atomê
10,012936862 ± 0,000000016 Da
g-factor
0,60015453333333 ± 0,00000026666666666667
natural abundance
19,65 ± 0,44
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin3
nuclear quadrupole moment
0,0846 ± 0,0002
dema îcadkirinê yan keşfê1920
parity+

11B

Hejmara baristeyî11
neutron number6
Giraniya atomê
11,009305166 ± 0,000000013 Da
g-factor
1,792252 ± 0,00000066666666666667
natural abundance
80,35 ± 0,44
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin3/2
nuclear quadrupole moment
0,04059 ± 0,0001
dema îcadkirinê yan keşfê1920
parity-

12B

Hejmara baristeyî12
neutron number7
Giraniya atomê
12,014352638 ± 0,000001418 Da
g-factor
1,003 ± 0,001
natural abundance
radioactivity☢️ radioactive element
half-life
20,2 ± 0,02 ms
spin1
nuclear quadrupole moment
0,0132 ± 0,0003
dema îcadkirinê yan keşfê1935
parity+

decay modeintensity
β (β decay)100%
βα (β-delayed α emission)0.6%

13B

Hejmara baristeyî13
neutron number8
Giraniya atomê
13,017779981 ± 0,000001073 Da
g-factor
2,1185333333333 ± 0,00033333333333333
natural abundance
radioactivity☢️ radioactive element
half-life
17,16 ± 0,18 ms
spin3/2
nuclear quadrupole moment
0,0365 ± 0,0008
dema îcadkirinê yan keşfê1956
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.266%

14B

Hejmara baristeyî14
neutron number9
Giraniya atomê
14,02540401 ± 0,000022773 Da
g-factor
0,5925 ± 0,0025
natural abundance
radioactivity☢️ radioactive element
half-life
12,36 ± 0,29 ms
spin2
nuclear quadrupole moment
0,0297 ± 0,0008
dema îcadkirinê yan keşfê1966
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)6.04%
2n (2-neutron emission)

15B

Hejmara baristeyî15
neutron number10
Giraniya atomê
15,031087023 ± 0,000022575 Da
g-factor
1,7726666666667 ± 0,01
natural abundance
radioactivity☢️ radioactive element
half-life
10,18 ± 0,35 ms
spin3/2
nuclear quadrupole moment
0,0379 ± 0,0011
dema îcadkirinê yan keşfê1966
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)98.7%
2n (2-neutron emission)1.5%

16B

Hejmara baristeyî16
neutron number11
Giraniya atomê
16,039841045 ± 0,000026373 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê2000
parity-

decay modeintensity
n (neutron emission)

17B

Hejmara baristeyî17
neutron number12
Giraniya atomê
17,046931399 ± 0,000219114 Da
g-factor
1,7 ± 0,013333333333333
natural abundance
radioactivity☢️ radioactive element
half-life
5,08 ± 0,05 ms
spin3/2
nuclear quadrupole moment
0,0385 ± 0,0015
dema îcadkirinê yan keşfê1973
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)63%
2n (2-neutron emission)12%
3n (3-neutron emission)3.5%
4n0.4%

18B

Hejmara baristeyî18
neutron number13
Giraniya atomê
18,055601683 ± 0,00021918 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin2
nuclear quadrupole moment
dema îcadkirinê yan keşfê2010
parity-

decay modeintensity
n (neutron emission)100%

19B

Hejmara baristeyî19
neutron number14
Giraniya atomê
19,064166 ± 0,000564 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
2,92 ± 0,13 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1984
parity-

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

20B

Hejmara baristeyî20
neutron number15
Giraniya atomê
20,074505644 ± 0,000586538 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1
nuclear quadrupole moment
dema îcadkirinê yan keşfê2018
parity-

decay modeintensity
n (neutron emission)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

21B

Hejmara baristeyî21
neutron number16
Giraniya atomê
21,084147485 ± 0,00059975 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê2018
parity-

decay modeintensity
2n (2-neutron emission)100%
Boron
Electron shell 005 Boron

dîrok

kaşîf an îcadkerSir H. Davy, J.L. Gay-Lussac, L.J. Thénard
location of discoveryEngland/France
dema îcadkirinê yan keşfê1808
BêjenasîFrom Arabic and Persian words for borax.
pronunciationBO-ron (îngilîzî)

source

Abundance
Abundance in Earth's crust
natural abundance (Okyanûs)
4,44 mg/L
natural abundance (human body)
0,00007 %
natural abundance (meteoroid)
0,00016 %
natural abundance (Roj)
0,0000002 %
Abundance in Universe
0,0000001 %

Nuclear Screening Constants

1s0.3205
2p2.5786
2s2.4238