Bh Bohrium
Element Information, Facts, Properties, Trends, Uses, Comparison with other elements

Bohrium is a chemical element with symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 270Bh, has a half-life of approximately 61 seconds.
It belongs to group 7 of the periodic table having trivial name .
Bohrium Facts
Read key information and facts about element Bohrium
Name | Bohrium |
Atomic Number | 107 |
Atomic Symbol | Bh |
Atomic Weight | 264 |
Phase | Solid |
Color | - |
Appearance | - |
Classification | Transition Metal |
Group in Periodic Table | 7 |
Group Name | manganese family |
Period in Periodic Table | period 7 |
Block in Periodic Table | d -block |
Electronic Configuration | [Rn] 5f14 6d5 7s2 |
Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 32, 13, 2 |
Melting Point | - |
Boiling Point | - |
CAS Number | CAS54037-14-8 |
How to Locate Bohrium on Periodic Table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 107 to find Bohrium on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Bohrium on periodic table look for cross section of group 7 and period 7 in the modern periodic table.
Bohrium History
The element Bohrium was discovered by G.Münzenberget al.(GSI in Darmstadt) in year 1981 in Germany. Bohrium was first isolated by in . Bohrium derived its name from Niels Bohr, physicist.
Obtained by bombarding bismuth with chromium.
Bohrium Presence: Abundance in Nature and Around Us
The table below shows the abundance of Bohrium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.
ppb by weight (1ppb =10^-7 %) | ppb by atoms (1ppb =10^-7 %) | |
---|---|---|
Abundance in Universe | - | - |
Abundance in Sun | - | - |
Abundance in Meteorites | - | - |
Abundance in Earth's Crust | - | - |
Abundance in Oceans | - | - |
Abundance in Humans | - | - |
Crystal Structure of Bohrium
The solid state structure of Bohrium is Simple Hexagonal.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
Unit Cell Parameters
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
a | b | c |
---|---|---|
and the angles between them Lattice Angles (alpha, beta and gamma).
alpha | beta | gamma |
---|---|---|
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
Space Group Name | - | ![]() |
Oxidation States | Space Group Number | - |
Crystal Structure | Simple Hexagonal |
Bohrium Atomic and Orbital Properties
Bohrium atoms have 107 electrons and the electronic shell structure is [2, 8, 18, 32, 32, 13, 2] with Atomic Term Symbol (Quantum Numbers) 6S5/2.
Atomic Number | 107 |
Number of Electrons (with no charge) | 107 |
Number of Protons | 107 |
Mass Number | 264 |
Number of Neutrons | 157 |
Shell structure (Electrons per energy level) | 2, 8, 18, 32, 32, 13, 2 |
Electron Configuration | [Rn] 5f14 6d5 7s2 |
Valence Electrons | 6d5 7s2 |
Valence (Valency) | 7 |
Main Oxidation States | 7 |
Oxidation States | 7 |
Atomic Term Symbol (Quantum Numbers) | 6S5/2 |
Bohr Atomic Model of Bohrium - Electrons per energy level

n | s | p | d | f |
---|
Ground State Electronic Configuration of Bohrium - neutral Bohrium atom
Abbreviated electronic configuration of Bohrium
The ground state abbreviated electronic configuration of Neutral Bohrium atom is [Rn] 5f14 6d5 7s2. The portion of Bohrium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Rn]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. This is important as it is the Valence electrons 6d5 7s2, electrons in the outermost shell that determine the chemical properties of the element.
Unabbreviated electronic configuration of neutral Bohrium
Complete ground state electronic configuration for the Bohrium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d5 7s2
Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.

Atomic Structure of Bohrium
Bohrium atomic radius is - , while it's covalent radius is - .
Atomic Radius Calculated | - (0 Å) |
Atomic Radius Empirical | - (0 Å) |
Atomic Volume | - |
Covalent Radius | - |
Van der Waals Radius | - |
Neutron Cross Section | - |
Neutron Mass Absorption | - |
Atomic Spectrum of Bohrium
Bohrium Chemical Properties: Bohrium Ionization Energies and electron affinity
The electron affinity of Bohrium is - .
Valence | 7 |
Electronegativity | - |
ElectronAffinity | - |
Ionization Energy of Bohrium
Refer to table below for Ionization energies of Bohrium
Ionization energy number | Enthalpy - kJ/mol |
---|
Bohrium Physical Properties
Refer to below table for Bohrium Physical Properties
Density | - |
Molar Volume | - |
Elastic Properties
Young Modulus | - |
Shear Modulus | - |
Bulk Modulus | - |
Poisson Ratio | - |
Hardness of Bohrium - Tests to Measure of Hardness of Element
Mohs Hardness | - |
Vickers Hardness | - |
Brinell Hardness | - |
Bohrium Electrical Properties
Bohrium is Conductor of electricity. Refer to table below for the Electrical properties ofBohrium
Electrical Conductivity | - |
Resistivity | - |
Superconducting Point | - |
Bohrium Heat and Conduction Properties
Thermal Conductivity | - |
Thermal Expansion | - |
Bohrium Magnetic Properties
Magnetic Type | - |
Curie Point | - |
Mass Magnetic Susceptibility | - |
Molar Magnetic Susceptibility | - |
Volume Magnetic Susceptibility | - |
Optical Properties of Bohrium
Refractive Index | - |
Acoustic Properties of Bohrium
Speed of Sound | - |
Bohrium Thermal Properties - Enthalpies and thermodynamics
Refer to table below for Thermal properties of Bohrium
Melting Point | - (-273.15°C, -459.66999999999996 °F) |
Boiling Point | - (-273.15°C, -459.66999999999996 °F) |
Critical Temperature | - |
Superconducting Point | - |
Enthalpies of Bohrium
Heat of Fusion | - |
Heat of Vaporization | - |
Heat of Combustion | - |
Bohrium Isotopes - Nuclear Properties of Bohrium
Bohrium has 16 isotopes, with between 260 and 275 nucleons. Bohrium has 0 stable naturally occuring isotopes.
Isotopes of Bohrium - Naturally occurring stable Isotopes: -.
Isotope | Z | N | Isotope Mass | % Abundance | T half | Decay Mode |
---|---|---|---|---|---|---|
260Bh | 107 | 153 | 260 | Synthetic | ||
261Bh | 107 | 154 | 261 | Synthetic | ||
262Bh | 107 | 155 | 262 | Synthetic | ||
263Bh | 107 | 156 | 263 | Synthetic | ||
264Bh | 107 | 157 | 264 | Synthetic | 1.5 h | AlphaEmission |
265Bh | 107 | 158 | 265 | Synthetic | ||
266Bh | 107 | 159 | 266 | Synthetic | ||
267Bh | 107 | 160 | 267 | Synthetic | ||
268Bh | 107 | 161 | 268 | Synthetic | ||
269Bh | 107 | 162 | 269 | Synthetic | ||
270Bh | 107 | 163 | 270 | Synthetic | ||
271Bh | 107 | 164 | 271 | Synthetic | ||
272Bh | 107 | 165 | 272 | Synthetic | ||
273Bh | 107 | 166 | 273 | Synthetic | ||
274Bh | 107 | 167 | 274 | Synthetic | ||
275Bh | 107 | 168 | 275 | Synthetic |
Regulatory and Health - Health and Safety Parameters and Guidelines
Database Search
List of unique identifiers to search the element in various chemical registry databases
Database | Identifier number |
---|---|
CAS Number - Chemical Abstracts Service (CAS) | CAS54037-14-8 |
RTECS Number | - |
CID Number | - |
Gmelin Number | - |
NSC Number | - |