We Use Cookies
We use cookies and other tracking technologies to improve your browsing experience on our website, to show you personalized content and targeted ads, to analyze our website traffic, and to understand where our visitors are coming from. For more information, please review our cookie policy and privacy policy.
By choosing I Accept, you consent to our use of cookies and other tracking technologies.

Fermium (Fm)

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.

Fermium in the periodic table

Atomic number100
Element categoryActinide

Physical properties

Phase at STPSolid
Density g/cm3
Atomic weight257 u
Melting point1800 K
1526.85 °C
2780.33 °F
Boiling point K

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity33.96 kJ/mol
Oxidation states+2, +3
Ionization energies
1627 kJ/mol
21225 kJ/mol
32363 kJ/mol
43792 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f12 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f12 6s2 6p6 7s2
Electrons per shell2, 8, 18, 32, 30, 8, 2


Discovered byLawrence Berkeley National Laboratory
Warning: Undefined variable $footer in /customers/a/d/1/periodictable.one/httpd.www/inc/footer.php on line 34