Element Samarium

Samarium ElementIt is a moderately hard silvery metal that slowly oxidizes in air. Being a typical member of the lanthanide series,
Samarium is a chemical element with the symbol Sm and atomic number 62.

Names and Identifiers

Chemical Formula:Sm
CAS:7440-19-9
Molecular Weight:150.360 g/mol
EC Number :231-128-7
MDL Number:MFCD00011233
Color:silvery-white
Other Names:Samario
PubChem CID:23951
IUPAC Name:Samarium
Inchl:InChI=1S/Sm
InChI Key:KZUNJOHGWZRPMI-UHFFFAOYSA-N
Canonical SMILES:[Sm]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:7.52 g/cm³
Boiling Point:1345 K ​(1072 °C, ​1962 °F)
Melting Point:2173 K ​(1900 °C, ​3452 °F)
Molecular Formula:Sm
Flash Point:n/a
Exact Mass:151.919693
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228-H261-H373
Precautionary Statements:P210-P231 + P232-P422
Hazard Codes:F:Highlyflammable;
Risk Phrases:R11
Safety Phrases:S16-S30-S33
RIDADR:UN 3089 4.1/PG 3
WGK Germany:3
RTECS:QO8575000
Packaging Group:I
Hazard Class:4.2

Naturally occurring samarium has a radioactivity of 128 Bq/g.
It is composed of four stable isotopes: 144Sm, 150Sm, 152Sm and 154Sm, and three extremely long-lived radioisotopes, 147Sm , 148Sm and 149Sm .

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
144Sm143.911998 (4)3.07 (7)0
147Sm146.914894 (4)14.99 (18)7/2-0.8149
148Sm147.914819 (4)11.24 (10)0
149Sm148.917180 (4)13.82 (7)7/2-0.6718
150Sm149.917273 (4)7.38 (1)0
152Sm151.919728 (4)26.75 (16)0
154Sm153.922205 (4)22.75 (29)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
145Sm144.913407340 dEC to 145Pm7/2-1.1
146Sm145.9130381.03 x 108 yα to 142Nd0
151Sm150.91992990 yβ to 151Eu5/2-0.363
153Sm152.9220941.929 dβ to 153Eu3/2-0.0216
155Sm154.92463622.2 mβ to 155Eu3/2
156Sm155.925539.4 hβ to 156Eu0

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