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Curium (Cm)

From Wikipedia, the free encyclopediaCurium is a transuranic radioactive chemical element with symbol Cm and atomic number 96. This element of the actinide series was named after Marie and Pierre Curie – both were known for their research on radioactivity. Curium was first intentionally produced and identified in July 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.

Curium in the periodic table

SymbolCm
Atomic number96
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density13.51 g/cm3
Atomic weight247 u
Melting point1613 K
1339.85 °C
2443.73 °F
Boiling point3383 K
3109.85 °C
5629.73 °F

Atomic properties

Electronegativity (Pauling Scale)1.28
Electron affinity27.17 kJ/mol
Oxidation states+3, +4, +5, +6
(an amphoteric oxide)
Ionization energies
1581 kJ/mol
21196 kJ/mol
32026 kJ/mol
43550 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f7 6d1 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 6d1 7s2
Electrons per shell2, 8, 18, 32, 25, 9, 2

History

Discovered1944
Discovered byGlenn T. Seaborg
Ralph A. James
Albert Ghiorso
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