Periodic Table

Bohrium

Transition Metal

Quick Facts about Bohrium

Sg
  • solid- state of matter at room temperature
  • Radioactive- no stable isotopes exist
  • 7, 5, 4, 3- common oxidation states in compounds
Hs

Bohrium (Bh) is element 107 on the periodic table. Atomic mass of Bh: 270.0000 u. Bh is in period 7, group 7. Density of Bh: 37.10 g/cm³.

Why Bohrium Matters

Bohrium in everyday life and industry

In Your Home

  • No commercial applications
  • Research element only
  • Studies relativistic effects in chemistry
  • Extremely short half-life

In Your Body

✗ Not essential

No biological role. Impossible to study biologically. Half-life measured in seconds.

Safety: Bohrium is radioactive

Discovery of Bohrium

Discovered by Heavy Ion Research Laboratory (HIRL) in Germany, 1976

Name origin: Named in honor of Niels Bohr

History & Events

1976
Named after Niels Bohr
1976
Bohr developed the atomic model
1981
Discovered at GSI Darmstadt in 1981
1976
Confirmed by later experiments

About Bohrium

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 Properties of Bh

Atomic Number of Bh
107
Atomic Mass of Bh
270.0000 u
Electron Configuration
[Rn] 5f14 6d5 7s2
Electronegativity
Block
d-block
Group
7
Period
7

Physical Properties of Bh

Phase (STP)
solid
Melting Point of Bh
Boiling Point of Bh
Density of Bh
37.1000 g/cm3

Atomic Radii

Covalent
141 pm

Common Misconceptions

Wrong:Bohr's atomic model is still the accepted theory.
Correct:Bohr's 1913 model was revolutionary but superseded by quantum mechanics; it remains useful for basic understanding.
Wrong:The name 'bohrium' was used from the start.
Correct:Soviets initially proposed 'nielsbohrium'; IUPAC shortened it to 'bohrium' in 1997.
Wrong:Nothing is known about bohrium's chemistry.
Correct:Despite producing only a few atoms at a time, researchers have confirmed Bh behaves like rhenium (group 7).

Isotopes of Bohrium

Bohrium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.

IsotopeAtomic Mass (u)AbundanceHalf-LifeDecay Mode
272107Bh (Bh-272)Bohrium-272 isotope272.13826

Data source: NIH PubChem (aggregated from IUPAC, NIST)

Uses

It has no significant commercial applications.

Sources

Obtained by bombarding bismuth-204 with chromium-54.

Geochemistry

Goldschmidt
synthetic

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