Promethium

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Promethium,  61Pm
General properties
Name, symbol Promethium, Pm
Pronunciation /proʊˈmiːθiəm/
(proh-MEE-thee-əm)
Appearance Metallic
Promethium in the periodic table
-

Pm

Np
NeodymiumPromethiumSamarium
Atomic number 61
Standard atomic weight (Ar)
Group, block n/a; f-block
Period period 6
Electron configuration [Xe] 4f5 6s2
per shell
2, 8, 18, 23, 8, 2
Physical properties
Phase Solid
Melting point 1315 K ​(1042 °C, ​1908 °F)
Boiling point 3273 K ​(3000 °C, ​5432 °F)
Density near r.t. 7.26 g/cm3
Heat of fusion 7.13 kJ/mol
Heat of 289 kJ/mol
Atomic properties
Oxidation states +2, +3
energies 1st: 540 kJ/mol
2nd: 1050 kJ/mol
3rd: 2150 kJ/mol
Atomic radius empirical: 183 pm
Covalent radius 199 pm
Miscellanea
Crystal structure
Thermal expansion 9.0 µm/(m·K) (at room temperature)
Thermal conductivity 17.9 W/(m·K)
Electrical resistivity 0.75 Ω·m (at 20 °C) (estimated)
Magnetic ordering paramagnetic
Young's modulus α form: est. 46 GPa
Shear modulus α form: est. 18 GPa
Bulk modulus α form: est. 33 GPa
Poisson ratio α form: est. 0.28 GPa
CAS Registry Number 7440-12-2
History
Discovery Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942)
First isolation Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin (1945)
Named by Grace Mary Coryell (1945)
· references

Promethium is an extremely radioactive lanthanide. It is one of two elements with no stable isotopes before bismuth, the other being technetium.

Properties

Chemical

The chemistry of promethium is very similar to that of other lanthanides.

Physical

Availability

Promethium is extremely hard to find, but some sellers do exist. It's very expensive.

Isolation

To do

Projects

  • Element collection

Handling

Safety

To do

Storage

To do

Disposal

To do

References

Relevant Sciencemadness threads