Prometium Element Facts/Chemistry

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61
Pm
(145)

a prometium kémiai elem lantánid és ritkaföldfémnek minősül. Jacob fedezte fel 1945. A. Marinsky, Lawrence E. Glendenin és Charles D. Coryell.,r>

Color: silvery-white Atomic weight: (145), no stable isotopes State: solid Melting point: 1142oC, 1415 K Boiling point: 3300oC, 3573 K Electrons: 61 Protons: 61 Neutrons in most abundant isotope: 84 Electron shells: 2,8,18,23,8,2 Electron configuration: 4f5 6s2 Density @ 20oC: 7.,220 g/cm3

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Reactions, Compounds, Radii, Conductivities

Atomic volume: 22.39 cm3/mol
Structure: cp: close packed (ABCB)
Hardness:
Specific heat capacity 0.18 J g-1 K-1
Heat of fusion 7.13 kJ mol-1
Heat of atomization 356 kJ mol-1
Heat of vaporization 332.,63 kJ mol-1
1st ionization energy 535.9 kJ mol-1
2nd ionization energy 1052 kJ mol-1
3rd ionization energy 2150 kJ mol-1
Electron affinity
Minimum oxidation number 0
Min. common oxidation no. 0
Maximum oxidation number 3
Max. common oxidation no., 3
Electronegativity (Pauling Scale)
Polarizability volume 30.,e
Oxide(s) Pm2O3
Hydride(s)
Chloride(s) PmCl3
Atomic radius 185 pm
Ionic radius (1+ ion)
Ionic radius (2+ ion)
Ionic radius (3+ ion) 113 pm
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity 17.,9 W m-1 K-1
Elektromos vezetőképesség 2 x 106 S m-1
Fagyasztás/Olvadáspont:: 1142oC, 1415 K