Periodic table of the elements
EinsteiniumFermiumMendelevium
100
Fm
Fermium
(257)
2
8
18
32
30
8
2
100
Fm
Fermium
(257)
2
8
18
32
30
8
2
General
NameFermium
SymbolFm
Number100
Chemical seriesActinides
Group / Period0 / 7
Blockf-block
CAS registry number7440-72-4

Fermium is a radioactive element

Physical properties
Statesolid
Density g/cm3
Melting point1800 K (1527 °C, 2781 °F)
Boiling point
Critical point

Atomic properties
Atomic Weight(257) g/mol
Crystal structure
Electronegativity1.30
Atomic radius
Atomic radius (calculated)
Electron configuration[Rn] 5f12 7s2
Electrons per shell2, 8, 18, 32, 30, 8, 2
Number of protons100
Number of neutrons157

Other languages
SpanishFermio
PortugueseFérmio
FrenchFermium
GermanFermium
ItalianFermio
RussianФермий
PolishFerm
Chinese
Arabicفرميوم
TurkishFermiyum
DutchFermium


Periodic table of the elements
EinsteiniumFermiumMendelevium