Americium

Symbol AmAtomic number 95
Atomic mass
243
Thermal conductivity
0.1
Atomic radius
...
Covalent radius
...
Density
13.6
Atomic volume
18.28
Melting point
1268
Oxidation states
6,5,4,3
Boiling point
2880
Stable isotopes
0
Heat of vapor.
...
Electronegativity
1.3
Heat of fusion
14.4
First ionization
5.993
Specific heat
0.11
Electrical conduct.
...
Electron configuration

General descriptionNuclear data
Index

Periodic Table

Chemistry concepts
 
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Americium

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

The isotope americium-241 was made by bombarding uranium-238 with alpha particles (helium nuclei). This produced plutonium-241 which decays to the Am-241. This isotope decays slowly by alpha emission with a halflife of 500 years. It has been used as a source in smoke detectors.

Atomic dataNuclear data
Index

Periodic Table

Chemistry concepts

Reference
Pauling
Ch. 29
 
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Americium Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
95
241
241.056824
224.4963
1818.0
5/2
...
432.2y
a
5.64
95
243
243.061375
226.3635
1829.9
5/2
...
7.37ky
a
5.44
Atomic data
Index

Periodic Table

Chemistry concepts

Reference
Rohlf
 
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