CAS Number53850-36-5
PubChem CIDna
Atomic Radius-
Atomic Volume-
Atomic Weight[267]
Boiling Point5,500
Bulk Modulus
CategoryTransition metals
Crystal Structure
Covalent Radius157
Electrical Resistivity
Electron Configuration[Rn] 5f14 6d2 7s2
Electrons per shell2, 8, 18, 32, 32, 10, 2
Heat of Fusionna
Heat of Vaporizationna
Ionization Potential6.011
Magnetic Ordering
Magnetic Susceptibility
Mass Number104
Melting Point2,100
Atomic Number261
Oxidation States4
Poisson Ratio
Shear Modulus
Specific Heat Capacity-
Thermal Conductivity0.23
Van der Waals radius
Young's Modulus
Abundance in Earth's crustna
Abundance in Universena
Rf Rutherfordium 104 (265) 4 7 d 104 [Rn] 5f14 6d2 7s2 2 8 18 32 32 10 2 None Unknown {"1":"580"} 1 13.1 h 18.9h AlphaEmission TransitionMetal, Metal, Radioactive, Synthetic ruth-er-FORD-i-em Synthetic radioactive metal. It has no significant commercial applications. Made by bombarding californium-249 with beams of carbon-12 and 13, which produced an isotope with half lives of 4+ and 3 sec. dOj9ZjKnJcY Rutherfordium
Francium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France.

It was discovered when she was researching the radioactive decay of actinium-227.

Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle. Francium was named after France 104 1964 Workers at the Nuclear Institute at Dubna, and the University of California, Berkeley, USA. USSR, United States The origin of the Amercian Chemical Society preferred name is Lord "Rutherford", the physicist and chemist from New Zealand.

Isotopes of Francium

Standard Atomic Weight

Stable Isotopes

Unstable Isotopes

253Rf 254Rf 255Rf 256Rf 257Rf 258Rf 259Rf 260Rf 261Rf 262Rf 263Rf 264Rf 265Rf 266Rf 267Rf 268Rf

Francium is highly radioactive
Francium was the last element discovered in nature, rather than by synthesis
Due to its instability and rarity, there are no commercial applications for francium.

It has been used for research purposes in the fields of biology and of atomic structure.

Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.