Template:Infobox fermium

Fermium, 100Fm
Fermium
Pronunciation/ˈfɜːrmiəm/ (FUR-mee-əm)
Mass number[257]
Fermium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Er

Fm

(Upq)
einsteiniumfermiummendelevium
Atomic number (Z)100
Groupf-block groups (no number)
Periodperiod 7
Block  f-block
Electron configuration[Rn] 5f12 7s2
Electrons per shell2, 8, 18, 32, 30, 8, 2
Physical properties
Phase at STPsolid (predicted)
Melting point1800 K ​(1527 °C, ​2781 °F) (predicted)
Density (near r.t.)9.7(1) g/cm3 (predicted)[1][a]
Atomic properties
Oxidation states+2, +3
ElectronegativityPauling scale: 1.3
Ionization energies
  • 1st: 629 kJ/mol
  • [2]
Other properties
Natural occurrencesynthetic
Crystal structureface-centered cubic (fcc)
Face-centered cubic crystal structure for fermium

(predicted)[1]
CAS Number7440-72-4
History
Namingafter Enrico Fermi
DiscoveryLawrence Berkeley National Laboratory (1953)
Isotopes of fermium
Main isotopes[3] Decay
abun­dance half-life (t1/2) mode pro­duct
252Fm synth 25.39 h SF
α 248Cf
253Fm synth 3 d ε 253Es
α 249Cf
255Fm synth 20.07 h SF
α 251Cf
257Fm synth 100.5 d α 253Cf
SF
 Category: Fermium
| references
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (11) · (this table: )

References

  1. 1.0 1.1 Fournier, Jean-Marc (1976). "Bonding and the electronic structure of the actinide metals". Journal of Physics and Chemistry of Solids. 37 (2): 235–244. Bibcode:1976JPCS...37..235F. doi:10.1016/0022-3697(76)90167-0.
  2. https://pubs.acs.org/doi/10.1021/jacs.8b09068
  3. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  1. The density is calculated from the predicted metallic radius (Silva 2006) and the predicted close-packed crystal structure (Fournier 1976).