About

Bohrium is a synthetic element named in honor of Niels Bohr, a Danish physicist and a pioneer of quantum mechanics and atomic structure. It is a superheavy element whose most stable known isotope has a half-life of about one minute. It is expected to behave as a typical group 7 element, similar to rhenium, but only a few atoms have ever been created for study.

Atomic Properties

Atomic Number107

Atomic Weight270 u

Neutrons (common)163

Electron Configuration[Rn] 5f¹⁴ 6d⁵ 7s²

Full Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁵ 7s²

Electrons per Shell2, 8, 18, 32, 32, 13, 2

Oxidation States+7, +5, +4, +3

Periodic Table Position

Group7

Period7

BlockD

Chemical SeriesTransition metals

Physical Properties

State at STPsolid

Appearancepredicted to be a silvery-white or gray metal

Crystal Structurehcp

Magnetic Orderingparamagnetic

Discovery

Discovered byGesellschaft für Schwerionenforschung

Discovery Year1,981

Occurrencesynthetic

CAS Number54037-14-8

Electron Configuration

Energy

↿⇂

1s

↿⇂

2s

↿⇂

2p

↿⇂

3s

↿⇂

3p

↿⇂

4s

↿⇂

3d

↿⇂

4p

↿⇂

5s

↿⇂

4d

↿⇂

5p

↿⇂

6s

↿⇂

4f

↿⇂

5d

↿⇂

6p

↿⇂

7s

↿⇂

5f

↿

6d

7p

Isotopes of Bohrium

Symbol ▲	Mass (u) ▲	Abundance ▲	Half-life ▲	Decay Mode ▲
²⁷²Bh	272.138260	—	9.8 s	Alpha Decay