Periodic table

 

 

Atomic number:61

Group numbers:3

Period:6

Electronic configuration:[Xe] 4f⁵ 6s²

Formal oxidation number:+3

Electronegativities:-

Atomic radius / pm:183.4

Relative atomic mass:[145]

 

Promethium was discovered by Jacob Akiba Marinsky, Lawrence Elgin Glendenin, and Charles DuBois Coryell (US) in 1947. Named after Prometheus in Greek mythology, who stole fire from the gods. It is a rare earth metal of synthetic origin on the earth, naturally made in stars. It is Poisonous, radiotoxic and radioactive. Promethium does not occur naturally. It is found among fission products of uranium, thorium and plutonium. It has been used as a source of radioactivity for thickness-measuring gages.

PHYSICAL PROPERTIES

Density / g dm^-3:7220 (298 K)

Molar volume / cm³mol^-1:20.08 (298 K)

Electrical resistivity / μΩcm:- (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:17.9

Melting point / °C:1042

Boiling point / °C:3000

Heat of fusion / kJ mol^-1:12.6

Heat of vaporization / kJ mol^-1:-

Heat of atomization / kJ mol^-1:308

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:538.39

Second ionization energy / kJ mol^-1:1051.70

Third ionization energy / kJ mol^-1:2151.64

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. "Promethium." EniG. Periodic Table of the Elements. 3 Jan. 2012. KTF-Split. {Date of access}. <http://www.periodni.com/pm.html>.