Bohrium (Bh)

Bohrium is the 107th element in the periodic table and has a symbol of Bh and atomic number of 107. It has an atomic weight of (274) and a mass number of 260. Bohrium has one hundred seven protons and one hundred fifty-three neutrons in its nucleus, and one hundred seven electrons in seven shells. It is located in group seven, period seven and block d of the periodic table. Radioactive transition metal. Half-life of approximately 1/500 s. Discovered by the Joint Institute for Nuclear Research at Dubna (U.S.S.R.) in 1976. Confirmed by West German physicists at the Heavy Ion Research Laboratory at Darmstadt.

Atomic Number	107
Atomic Weight	274
Mass Number	260

Group	7
Period	7
Block	d

Protons	107 p⁺
Neutrons	153 n⁰
Electrons	107 e^-

Properties

Physical Properties
Atomic Radius
Molar Volume
Covalent Radius	141 pm 128 pm 119 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density	37.1 g/cm³
Energy
Proton Affinity
Electron Affinity
Ionization Energy	7.7 eV/particle 17.5 eV/particle 26.7 eV/particle 37.3 eV/particle 49 eV/particle 62.1 eV/particle 74.9 eV/particle 134 eV/particle 148 eV/particle 178 eV/particle 198 eV/particle 228 eV/particle 255 eV/particle 281 eV/particle 318 eV/particle 337 eV/particle 374 eV/particle 934 eV/particle 969 eV/particle 1,008 eV/particle 1,049 eV/particle 1,088 eV/particle 1,126 eV/particle 1,197 eV/particle 1,237 eV/particle 1,280 eV/particle 1,320 eV/particle 4,216 eV/particle 4,301 eV/particle 4,390 eV/particle 4,486 eV/particle 4,580 eV/particle 4,660 eV/particle 4,890 eV/particle 4,980 eV/particle 5,080 eV/particle 5,170 eV/particle 5,550 eV/particle 5,640 eV/particle 5,740 eV/particle 5,830 eV/particle 6,650 eV/particle 6,760 eV/particle 7,040 eV/particle 7,140 eV/particle 10,930 eV/particle 11,130 eV/particle 11,340 eV/particle 11,560 eV/particle 11,780 eV/particle 11,980 eV/particle 12,610 eV/particle 12,830 eV/particle 13,070 eV/particle 13,300 eV/particle 13,900 eV/particle 14,100 eV/particle 14,300 eV/particle 14,500 eV/particle 17,000 eV/particle 17,300 eV/particle 17,700 eV/particle 18,000 eV/particle 35,200 eV/particle 35,700 eV/particle 36,300 eV/particle 36,800 eV/particle 46,100 eV/particle 46,900 eV/particle 47,800 eV/particle 190,331 eV/particle

Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons
Electron Shells	2, 8, 18, 32, 32, 13, 2

Valence Electrons	2
Electron Configuration	[Rn] 5f¹⁴ 6d⁵ 7s²

Oxidation States	7
Electronegativity
Electrophilicity
Phases
Phase	Solid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Bohrium is a Colorless. Bh has a Jmol of #e00038.
Color	Colorless #e00038
Appearance
Refractive Index
Thermodynamic Properties
Thermal Conductivity
Thermal Expansion
Molar Heat Capacity
Specific Heat Capacity
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type
Electrical Conductivity
Electrical Resistivity
Superconducting Point
Magnetism
Type
Magnetic Susceptibility (Mass)
Magnetic Susceptibility (Molar)
Magnetic Susceptibility (Volume)
Magnetic Ordering
Curie Point
Neel Point
Structure
The lattice angles of Bohrium is .
Crystal Structure	()
Lattice Constant
Lattice Angles
Mechanical Properties

Hardness
Bulk Modulus
Shear Modulus
Young Modulus
Poisson Ratio
Speed of Sound
Classification
The CAS Group of Bohrium is VIIA. The IUPAC Group of Bh is VIIB. The Mendeleev Number of Element 107 is 58. The Goldschmidt Class of Bohrium (Bh) is synthetic.
Category	Transition metals, Transition metals
CAS Group	VIIA
IUPAC Group	VIIB
Glawe Number
Mendeleev Number	58
Pettifor Number
Geochemical Class
Goldschmidt Class	synthetic
Other
The Dipole Polarizability of Bohrium is 38 plus or minus 4 a₀. The Allotropes of Bh is . The Quantum Numbers of Element 107 is 6S5/2. The Space Group of Bohrium (Bh) is ().
Gas Basicity
Dipole Polarizability	38 ± 4 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	6S5/2
Space Group	()

Isotopes of Bohrium

Stable Isotopes	0
Unstable Isotopes	19
Radioactive Isotopes	19

²⁶⁰Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	260.121443 ± 0.000211 Da
Mass Number	260
G-Factor
Half Life	41 ± 14 ms
Spin
Quadrupole Moment
Discovery Year	2008
Parity

²⁶⁰Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%
SF (spontaneous fission)	%

²⁶¹Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	261.121395733 ± 0.000193026 Da
Mass Number	261
G-Factor
Half Life	12.8 ± 3.2 ms
Spin	5/2
Quadrupole Moment
Discovery Year	1989
Parity	-

²⁶¹Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%
SF (spontaneous fission)	%

²⁶²Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	262.122654688 ± 0.000099919 Da
Mass Number	262
G-Factor
Half Life	84 ± 11 ms
Spin
Quadrupole Moment
Discovery Year	1981
Parity

²⁶²Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%
SF (spontaneous fission)	20%

²⁶³Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	263.122916 ± 0.000328 Da
Mass Number	263
G-Factor
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year
Parity	-

²⁶³Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁶⁴Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	264.124486 ± 0.00019 Da
Mass Number	264
G-Factor
Half Life	1.07 ± 0.21 s
Spin
Quadrupole Moment
Discovery Year	1995
Parity

²⁶⁴Bh Decay Modes

Decay Mode	Intensity
α (α emission)	86%
SF (spontaneous fission)	14%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

²⁶⁵Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	265.124955 ± 0.000257 Da
Mass Number	265
G-Factor
Half Life	1.19 ± 0.52 s
Spin	5/2
Quadrupole Moment
Discovery Year	2004
Parity	-

²⁶⁵Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁶⁶Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	266.12679 ± 0.000175 Da
Mass Number	266
G-Factor
Half Life	10.6 ± 2.2 s
Spin
Quadrupole Moment
Discovery Year	2000
Parity

²⁶⁶Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%
SF (spontaneous fission)	%

²⁶⁷Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	267.127499 ± 0.000282 Da
Mass Number	267
G-Factor
Half Life	22 ± 10 s
Spin	5/2
Quadrupole Moment
Discovery Year	2000
Parity	-

²⁶⁷Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁶⁸Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	268.129584 ± 0.00041 Da
Mass Number	268
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁶⁸Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁶⁹Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	269.130411 ± 0.000402 Da
Mass Number	269
G-Factor
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year
Parity	-

²⁶⁹Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁷⁰Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	270.133366 ± 0.00032 Da
Mass Number	270
G-Factor
Half Life	3.8 ± 3 m
Spin
Quadrupole Moment
Discovery Year	2007
Parity

²⁷⁰Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷¹Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	271.135115 ± 0.000412 Da
Mass Number	271
G-Factor
Half Life	2.9 ± 1.9 s
Spin
Quadrupole Moment
Discovery Year	2013
Parity

²⁷¹Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷²Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	272.138259 ± 0.000571 Da
Mass Number	272
G-Factor
Half Life	11.3 ± 1.8 s
Spin
Quadrupole Moment
Discovery Year	2004
Parity

²⁷²Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷³Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	273.140294 ± 0.000703 Da
Mass Number	273
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷³Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁷⁴Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	274.143599 ± 0.00062 Da
Mass Number	274
G-Factor
Half Life	57 ± 27 s
Spin
Quadrupole Moment
Discovery Year	2010
Parity

²⁷⁴Bh Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷⁵Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	275.145766 ± 0.000644 Da
Mass Number	275
G-Factor
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year
Parity	-

²⁷⁵Bh Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	%

²⁷⁶Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	276.149169 ± 0.000644 Da
Mass Number	276
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷⁶Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁷⁷Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	277.151477 ± 0.000644 Da
Mass Number	277
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷⁷Bh Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁷⁸Bh

Abundance	Radioactive ☢️
Relative Atomic Mass	278.154988 ± 0.000429 Da
Mass Number	278
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year	2016
Parity

²⁷⁸Bh Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	100%
α (α emission)	%

History

Bohrium was first convincingly synthesized in 1981 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt. The team bombarded a target of bismuth-209 with accelerated nuclei of chromium-54 to produce 5 atoms of the isotope bohrium-262. Named after Niels Bohr, the Danish physicist

Discoverers	Heavy Ion Research Laboratory (HIRL)
Discovery Location	Germany
Discovery Year	1976
Etymology (Name Origin)	Named in honor of Niels Bohr
Pronunciation	neels-BOR-i-em (English)

Bohrium is harmful due to its radioactivity

The only confirmed example of isomerism in bohrium is in the isotope ²⁶²Bh

Uses

Bohrium is used for scientific research purposes only. It has no significant commercial applications.

Sources

Obtained by bombarding bismuth-204 with chromium-54.

Abundance
Abundance in Earth's crust
Abundance in Oceans
Abundance in Human Body	0 %
Abundance in Meteor	0 %
Abundance in Sun	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Bohrium on ChemicalAid

Australian Educational Vocabulary ID	scot/2707
CAS Registry Number	54037-14-8
DSSTOX compound identifier	DTXCID901323014
DSSTox substance ID	DTXSID50893065
Den Store Danske ID	bohrium
Elhuyar ZTH ID	064404
Encyclopædia Britannica Online ID	science/bohrium
Freebase ID	/m/025s_py
French Vikidia ID	Bohrium
GND ID	4518310-7
Gran Enciclopèdia Catalana ID	0270290
Great Russian Encyclopedia Online ID	1878446
Interlingual Index ID	i113907
KBpedia ID	Bohrium
OmegaWiki Defined Meaning	156678
Quora topic ID	Bohrium
Store norske leksikon ID	bohrium
Treccani ID	bohrio
USGS Thesaurus ID	1411

Bohrium (Bh)

Properties

Isotopes of Bohrium

260Bh

260Bh Decay Modes

261Bh

261Bh Decay Modes

262Bh

262Bh Decay Modes

263Bh

263Bh Decay Modes

264Bh

264Bh Decay Modes

265Bh

265Bh Decay Modes

266Bh

266Bh Decay Modes

267Bh

267Bh Decay Modes

268Bh

268Bh Decay Modes

269Bh

269Bh Decay Modes

270Bh

270Bh Decay Modes

271Bh

271Bh Decay Modes

272Bh

272Bh Decay Modes

273Bh

273Bh Decay Modes

274Bh

274Bh Decay Modes

275Bh

275Bh Decay Modes

276Bh

276Bh Decay Modes

277Bh

277Bh Decay Modes

278Bh

278Bh Decay Modes