95Am243.061380
Americium
Actinide
Solid at STP
Period 7Block FDiscovered 1944
[Rn]7s2 5f7
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.
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Atomic Properties
| Atomic Number | 95 |
| Atomic Mass | 243.061380 u |
| Electron Configuration | [Rn]7s2 5f7 |
| Oxidation States | +6, +5, +4, +3 |
| Electronegativity | 1.3 (Pauling) |
| Atomic Radius | 244 pm |
| Ionization Energy | 5.993 eV |
| Block | F |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 1449 K (1175.8 °C) |
| Boiling Point | 2284 K (2010.8 °C) |
| Density | 13.69 g/cm³ |
| Molar Heat | 62.7 J/(mol·K) |
| CPK Color | #545CF2 |
Classification
| Category | Actinide |
| Group Block | Actinide |
| Period | 7 |
| Block | F |
Discovery
| Year Discovered | 1944 |
| Discovered By | Glenn T. Seaborg |
| Electron Shells | 2, 8, 18, 32, 25, 8, 2 |