Periodic table

 

 

Atomic number:87

Group numbers:1

Period:7

Electronic configuration:[Rn] 7s¹

Formal oxidation number:+1

Electronegativities:0.7

Atomic radius / pm:282

Relative atomic mass:[223]

 

Francium was discovered by Marguerite Perey (FR) in 1939. Named for France, the nation of its discovery. It is a highly rare and unstable, radioactive metal. Its chemical properties are similar to caesium. Francium is formed from the decay of actinium. It can be produced by bombarding radium or astatine with neutrons. Since its isotopes have such short half-lives there are no commercially significant compounds of francium.

PHYSICAL PROPERTIES

Density / g dm^-3:-

Molar volume / cm³mol^-1:-

Electrical resistivity / μΩcm:- (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:15

Melting point / °C:27

Boiling point / °C:677

Heat of fusion / kJ mol^-1:-

Heat of vaporization / kJ mol^-1:-

Heat of atomization / kJ mol^-1:75

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:392.96

Second ionization energy / kJ mol^-1:-

Third ionization energy / kJ mol^-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:-

in the oceans / ppm:-

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Francium." EniG. Periodic Table of the Elements. 3 Jan. 2012. KTF-Split. {Date of access}. <http://www.periodni.com/fr.html>.