95Solid
Am 243 Atomic mass · uActinides
Americium
Americium is a radioactive transuranic chemical element with symbol Am and atomic number 95. This member of the actinide series is located in the periodic table under the lanthanide element europium, and thus by analogy was named after the Americas. Americium was first produced in 1944 by the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical laboratory of University of Chicago.
Discovery 1944 (Glenn T. Seaborg)
K2L8M18N32O25P8Q2
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- 1,449K
- Boiling point
- 2,284K
- Atomic radius
- Not available
- Bonding type
- Metallic
- Molar heat
- 62.7J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 7 electrons; 7s, 2 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
95 electrons Orbital order preserved from source
- Electronegativity
- 1.3Pauling scale
- First ionization energy
- 578kJ/mol
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Am AmericiumAtomic number 95
578kJ/mol
Atomic numberGaps indicate unavailable data
About americium
- Appearance
- Silvery white
- Discovery
- 1944 (Glenn T. Seaborg)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.