100
Fm
257
Fermium (Fm)
Element 100 · Period 7 · Actinide series
actinide
solid at room temp
f-block
radioactive
synthetic
About Fermium
Named after Fermi. Only produced in nuclear reactors in tiny amounts.
Physical Properties
Atomic Mass
257 u
State at 25°C
Solid
Melting Point
1527 °C
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Rn] 5f¹² 7s²
Electron Shells
2, 8, 18, 32, 30, 8, 2
Electronegativity
1.3
Atomic Radius
245 pm
Ionization Energy
627 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Albert Ghiorso
Discovery Year
1952
Named By
Albert Ghiorso
Name origin: Enrico Fermi
Frequently Asked Questions
- Is Fermium a metal, nonmetal, or metalloid?
- Fermium is classified as a actinide.
- What state is Fermium in at room temperature?
- Fermium is a solid at standard room temperature (25°C).
- What is the atomic mass of Fermium?
- Fermium has an atomic mass of 257 atomic mass units (u).
- Who discovered Fermium?
- Fermium was discovered by Albert Ghiorso in 1952.
- Where is Fermium on the periodic table?
- Fermium is element number 100, located in period 7, part of the actinide series shown below the main table.