Symbol	Fm
Atomic number	100
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	-
Color	-

Number of protons	100 p+
Number of neutrons	157 n0
Number of electrons	100 e-

From Wikipedia, the free encyclopediaFermium is a synthetic element with symbol Fm and atomic number 100. It is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.

Phase at STP	Solid
Density	g/cm3
Atomic weight	257 u

Melting point	1800 K 1526.85 °C 2780.33 °F
Boiling point	-
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.3
Electron affinity	33.96 kJ/mol
Oxidation states	+2, +3 ()
Ionization energies	627 kJ/mol 1225 kJ/mol 2363 kJ/mol 3792 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f12 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f12 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f12 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 30, 8, 2
Valence electrons	2
Valency electrons	3
Bohr model	Figure: Shell diagram of Fermium (Fm) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Lawrence Berkeley National Laboratory (1952)

CAS Number	7440-72-4
ChemSpider ID	22434
EC number	-
PubChem CID Number	23998