Americium was discovered by Glenn Seaborg, Leon Morgan, Ralph James and Albert Ghiorso at the University of California, Berkeley in 1944.
Name: Americium
Symbol: Am
Atomic number: 95
Atomic weight: 243.06
State: solid
Group, period, block: n/a, 7, f
Color: silvery white
Classification: actinide
Electron configuration: 5f7 7s2
2,8,18,32,25,8,2
Physical properties
Density: 5.91 g/cm-3
Melting point: 1449 K,1176 �C,2149 �F
Boiling point: 2880 K,2607 �C,4725 �F
Atomic properties
Oxidation states: 7, 6, 5, 4, 3, 2
Electronegativity: 1.3 (Pauling scale)
Ionization energies: 1st: 578 kJ�mol-1
Covalent radius: 180�6 pm
Van der Waals radius: no data
- Am
- 01
- 01234567
- 01234567891011121314151617
- 012345678910111213141516171819202122232425262728293031
- 0123456789101112131415161718192021222324
- 01234567
- 01
Electron Configuration
Isotopes
Americium is an artificial element, it has no stable isotopes. The isotope first synthesized was 241Am in 1944.