بور

بور (B)

chemical element with symbol B and atomic number 5
Atomic Number5
Atomic Weight10.81
mass number11
Group13
Period2
Blockp
پروتون5 p+
neutron6 n0
ئېلېكترون5 e-
Animated بورمودىلى of B (بور)

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: بور0102030405060708090100110120130140150160170180190200pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

ئېنېرگىيە
proton affinity
electron affinity
0.279723 eV/particle
ionization energy
8.298019 eV/particle
ionization energy of B (بور)
enthalpy of vaporization
504.5 kJ/mol
enthalpy of fusion
23.6 kJ/mol
standard enthalpy of formation
565 kJ/mol
ئېلېكترون
ئېلېكترون قەۋەت2, 3
بورمودىلى: B (بور)
valence electron3
Lewis structure: B (بور)
electron configuration[He] 2s2 2p1
1s2 2s2 2p1
Enhanced بورمودىلى of B (بور)
Orbital Diagram of B (بور)
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
Curie temperature
Néel temperature
structure
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
speed of sound
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

mass number6
neutron number1
relative atomic mass
6.0508 ± 0.00215 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin2
nuclear quadrupole moment
time of discovery or invention
parity-

decay modeintensity
2p (2-proton emission)

7B

mass number7
neutron number2
relative atomic mass
7.029712 ± 0.000027 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
570 ± 14 ys
spin3/2
nuclear quadrupole moment
time of discovery or invention1967
parity-

decay modeintensity
p (proton emission)100%

8B

mass number8
neutron number3
relative atomic mass
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
time of discovery or invention1950
parity+

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

9B

mass number9
neutron number4
relative atomic mass
9.013329645 ± 0.000000969 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
800 ± 300 zs
spin3/2
nuclear quadrupole moment
time of discovery or invention1940
parity-

decay modeintensity
p (proton emission)100%

10B

mass number10
neutron number5
relative atomic mass
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
time of discovery or invention1920
parity+

11B

mass number11
neutron number6
relative atomic mass
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
time of discovery or invention1920
parity-

12B

mass number12
neutron number7
relative atomic mass
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
time of discovery or invention1935
parity+

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

13B

mass number13
neutron number8
relative atomic mass
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
time of discovery or invention1956
parity-

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

14B

mass number14
neutron number9
relative atomic mass
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
time of discovery or invention1966
parity-

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

15B

mass number15
neutron number10
relative atomic mass
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
time of discovery or invention1966
parity-

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

16B

mass number16
neutron number11
relative atomic mass
16.039841045 ± 0.000026373 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
time of discovery or invention2000
parity-

decay modeintensity
n (neutron emission)

17B

mass number17
neutron number12
relative atomic mass
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
time of discovery or invention1973
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

mass number18
neutron number13
relative atomic mass
18.055601683 ± 0.00021918 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin2
nuclear quadrupole moment
time of discovery or invention2010
parity-

decay modeintensity
n (neutron emission)100%

19B

mass number19
neutron number14
relative atomic mass
19.064166 ± 0.000564 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
2.92 ± 0.13 ms
spin3/2
nuclear quadrupole moment
time of discovery or invention1984
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

mass number20
neutron number15
relative atomic mass
20.074505644 ± 0.000586538 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1
nuclear quadrupole moment
time of discovery or invention2018
parity-

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

21B

mass number21
neutron number16
relative atomic mass
21.084147485 ± 0.00059975 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
time of discovery or invention2018
parity-

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

تارىخ

discoverer or inventorSir H. Davy, J.L. Gay-Lussac, L.J. Thénard
location of discoveryEngland/France
time of discovery or invention1808
etymologyFrom Arabic and Persian words for borax.
pronunciationBO-ron (ئىنگلىزچە)

source

Abundance
Abundance in Earth's crust
natural abundance (ئوكيانىيە)
4.44 mg/L
natural abundance (human body)
0.00007 %
natural abundance (meteoroid)
0.00016 %
natural abundance (قۇياش)
0.0000002 %
Abundance in Universe
0.0000001 %

Nuclear Screening Constants

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