Periodic Table

Berkelium

Actinide

Quick Facts about Berkelium

Cm
  • solid- state of matter at room temperature
  • Radioactive- no stable isotopes exist
  • +4, +3- common oxidation states in compounds
Cf

Berkelium (Bk) is element 97 on the periodic table. Atomic mass of Bk: 247.0000 u. Bk is in period 7. Melting point of Bk: 1259.00 K.Density of Bk: 14.78 g/cm³.

Why Berkelium Matters

Berkelium in everyday life and industry

In Your Home

  • No commercial applications exist
  • Used only in scientific research
  • Produces californium when irradiated
  • Extremely rare and expensive

In Your Body

✗ Not essential

No biological role. Would accumulate in bones like other actinides. Limited biological studies due to scarcity.

Safety: Berkelium is radioactive and hazardous

Discovery of Berkelium

Discovered by G.T.Seaborg, S.G.Tompson, A.Ghiorso in United States, 1949

Name origin: Named after Berkeley, California the city of its discovery.

History & Events

1949
Named after Berkeley, California
1949
Discovered by Seaborg, Thompson, and Ghiorso in 1949
1949
Fifth transuranium element discovered at Berkeley
1949
Parallels terbium (named after a place) above it

About Berkelium

Radioactive metallic transuranic element. Belongs to actinoid series. Eight known isotopes, the most common Bk-247, has a half-life of 1.4*10^3 years. First produced by Glenn T. Seaborg and associates in 1949 by bombarding americium-241 with alpha particles.

Atomic Properties of Bk

Atomic Number of Bk
97
Atomic Mass of Bk
247.0000 u
Electron Configuration
[Rn] 5f9 7s2
Electronegativity
1.30
Block
f-block
Group
Period
7

Physical Properties of Bk

Phase (STP)
solid
Melting Point of Bk
1259.00 K
Boiling Point of Bk
2900.00 K
Density of Bk
14.7800 g/cm3

Atomic Radii

Covalent
168 pm
Van der Waals
244 pm

Common Misconceptions

Wrong:Berkelium is named after a random city.
Correct:Berkeley was chosen because the element was synthesized at UC Berkeley, following the tradition of naming elements after their discovery location.
Wrong:Berkelium's naming doesn't follow a periodic table pattern.
Correct:Berkelium parallels terbium's naming—both are named after places and occupy analogous positions in the f-block.
Wrong:No one has ever seen berkelium.
Correct:Visible (microgram) amounts of berkelium have been produced, unlike some heavier transuranium elements.

Isotopes of Berkelium

Berkelium has 0 naturally occurring isotopes, plus 2 notable radioactive isotopes.

IsotopeAtomic Mass (u)AbundanceHalf-LifeDecay Mode
24797Bk (Bk-247)Berkelium-247 isotope247.0703073
24997Bk (Bk-249)Berkelium-249 isotope249.0749877

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

Uses

It has no significant commercial applications.

Sources

Some compounds have been made and studied. Made by bombarding americium with alpha particles.

Geochemistry

Goldschmidt
synthetic

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