Promethium Element Properties

Promethium

f60
Nd
Neodymium
f61
Pm
Promethium
f62
Sm
Samarium
General
Name(Promethium)
Symbol(Pm)
Number(61)
Group Number(NA)
Group(Rare Earth, Lanthanides)
Block(f)
Density(6.475 g/cm3)
Atomic Weight(145 g/mol)
Atomic Volume(22.39 cm3/mol)
Discover(1945)


States
State(Solid)
Melting Point(1315 K)
Boiling Point(3273 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(7.13 kJ/mol)
Heat of Vaporization(289 kJ/mol)


Energies
First Ionization Energy(535.9 kJ/mole)
Second Ionization Energy(1052 kJ/mole)
Third Ionization Energy(2150 kJ/mole)
Electronegativity(1.15)
Electron Affinity(50 kJ/mole)
Specific Heat(0.18 J/gK)
Heat Atomization(301 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,18,23,8,2)
Electron Configuration([Xe] 4f5 6s2)
Minimum Oxidation Number(0)
Maximum Oxidation Number(3)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(3)


Appearance and Characteristics
Crystal Structure(hexagonal)
Characteristics(Radioactive)
Color(silvery-white)
Uses(nuclear battery)
Hardness(Nil)
Toxicity(None)


Reactions
Reaction with Air(vigorous, =>Pm2O3)
Reaction with 6M HCl(mild, =>H2, PmCl3)
Reaction with 15M HNO3(mild, =>Pm(NO3)3)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(0)
Hydride(None)
Oxide(Pm2O3)
Chloride(None)


Radius
Atomic Radius(183 pm)
Ionic Radius (1+ ion)(Nil)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(Nil)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(111 pm)


Conductivity
Thermal Conductivity(17.9 J/m-sec-deg)
Electrical Conductivity(Nil)
Polarizability(30.1 A3)


Abundance
Source(Synthetic)
Relation Abundance Solar System(Nil)
Abundance Earths Crust(-19.3 log)


f60
Nd
Neodymium
f61
Pm
Promethium
f62
Sm
Samarium

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