The periodic table/Samarium
- Paul-Émile Lecoq de Boisbaudran, in which most sources link Boisbaudran as the discoverer of Samarium, isolated a samarium salt in 1879, in Paris.
- First, Boisbaudran extracted ‘didymium’ from the mineral samarskite and made a solution of ‘didymium’ nitrate. He then added ammonium hydroxide and found two precipitates were formed; one containing ‘didymium’ and the other a new element – samarium.
- The new element samarium was named after the mineral samarskite in which it had been found.
Discovered in: 1879
Electron Configuration: Xe 4f6 6s2
CAS Number: 7440-19-9
Appearance: silvery-white metal
Key Isotopes: 152Sm
Allotropes: α-samarium, β-samarium, γ-samarium
Density: 7.54 grams per cubic centimeter
Crystal Structure: rhombohedral
Melting Point: 1,074°C
Boiling Point: 1,794°C
- Samarium is used as a catalyst for the dehydration and dehydrogenation of ethanol, and is also used in infrared absorbing glass.
- Radioactive 153Samarium is used in the treatment of cancer.
- Samarium is used as an absorb-er in nuclear reactors.
- Main use of Samarium is in samarium-cobalt alloy magnets. These magnets are resistant to demagnetization.
Atomic radius: 229 pm
Covalent radius: 198 pm
Electron affinity: 0.162 (theoretical)
First: 1st: 544.5 kJ/mol
Second: 2nd: 1070 kJ/mol
Third: 3rd: 2260 kJ/mol
Relative supply risk: 9.5
Crustal abundance: 0.3 ppm
Recycling rate: <10%
Production concentration: 97%
Reserve distribution: 50%
Oxidation States and Isotopes
Common oxidation states: 3, 2
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