95
Am
243
Americium (Am)
Element 95 · Period 7 · Actinide series
actinide
solid at room temp
f-block
radioactive
synthetic
About Americium
Synthetic actinoid. Am-241 used in smoke detectors.
Physical Properties
Atomic Mass
243 u
State at 25°C
Solid
Melting Point
1176 °C
Boiling Point
2607 °C
Density
13.69 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Rn] 5f⁷ 7s²
Electron Shells
2, 8, 18, 32, 25, 8, 2
Electronegativity
1.3
Atomic Radius
244 pm
Ionization Energy
578 kJ/mol
Oxidation States
+3, +4
Discovery & History
Discovered By
Glenn T. Seaborg
Discovery Year
1944
Named By
Glenn T. Seaborg
Name origin: Americas
Frequently Asked Questions
- Is Americium a metal, nonmetal, or metalloid?
- Americium is classified as a actinide.
- What state is Americium in at room temperature?
- Americium is a solid at standard room temperature (25°C).
- What is the atomic mass of Americium?
- Americium has an atomic mass of 243 atomic mass units (u).
- Who discovered Americium?
- Americium was discovered by Glenn T. Seaborg in 1944.
- Where is Americium on the periodic table?
- Americium is element number 95, located in period 7, part of the actinide series shown below the main table.