Curium

Symbol CmAtomic number 96...
Atomic mass
247
 Thermal conductivity
0.1
Atomic radius
...
 Covalent radius
...
Density
13.511
 Atomic volume
18.28
Melting point
1613
 Oxidation states
3
Boiling point
...
 Stable isotopes
0
Heat of vapor.
...
 Electronegativity
1.3
Heat of fusion
15.0
 First ionization
6.02
Specific heat
...
 Electrical conduct.
...
Electron configuration

General descriptionNuclear data
 Index

Periodic Table

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Curium

Curium, a trans-uranic element, was first discovered by Glenn Seaborg and collaborators at the University of California, Berkeley.

Curium was made by bombarding plutonium-239 with helium nuclei which had been accelerated in the cyclotron. The capture of the helium nucleus and the emission of a neutron left the isotope curium-242. Cm-242 is an alpha emitter with a half-life of about five years. Another isotope, curium-240, has been produced by the same bombardment, where three neutrons are released in the interaction.

Atomic dataNuclear data
 Index

Periodic Table

Chemistry concepts

Reference
Pauling
Ch. 29
 
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Curium Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
96
240
240.055503
223.5630
1810.3
0
...
27d
a
6.40
96
247
247.070347
230.0974
1853.0
9/2
...
15.6My
a
5.35
96
248
248.072343
231.0307
1859.2
0
...
0.34My
a, SF
5.16
96
250
250.078352
232.8993
1869.8
0
...
9.7ky
SF,a,b-
5.27,1.42
SF = spontaneous fission
Atomic data
Index

Periodic Table

Chemistry concepts

Reference
Rohlf
 
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