Americium (Am) — Element 95: Properties & Data | Aladdin Scientific
Americium(Am) — Element 95
Americium (Am) is a actinide with atomic number 95 and atomic mass 243.061. It has melting point 1449 K (1176 °C), boiling point 2284 K (2011 °C), density 13.69 g/cm³. It sits in period 7 of the periodic table and was discovered in 1944.
Key facts
| Atomic mass | 243.0614 u |
|---|---|
| Electron configuration | [Rn]7s2 5f7 |
| Oxidation states | +6, +5, +4, +3 |
| Electronegativity (Pauling) | 1.3 |
| Atomic radius (van der Waals) | 244 pm |
| Ionization energy | 5.993 eV |
| Melting point | 1449 K |
| Boiling point | 2284 K |
| Density | 13.69 g/cm³ |
| Standard state | Solid |
| Year discovered | 1944 |
Frequently asked questions
What is the electron configuration of americium?
The ground-state electron configuration of americium is [Rn]7s2 5f7.
What group and period is americium in?
Americium (Am) is in period 7 (actinide series) of the periodic table, classified as a actinide.
What is the melting point of americium?
Americium melts at 1449 K (1176 °C).
What is the standard state of americium?
Americium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .