Element Lanthanum

Lanthanum ElementIt is a chemical element with the symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air and is soft enough to be cut with a knife.
Element Lanthanum usually occurs together with cerium and the other rare earth elements. Lanthanum was first found by the Swedish chemist Carl Gustav Mosander in 1839 as an impurity in cerium nitrate – hence the name lanthanum, from the Ancient Greek λανθάνειν (lanthanein), meaning “to lie hidden”.
Lanthanum compounds have numerous applications as catalysts, additives in glass, carbon arc lamps for studio lights and projectors, ignition elements in lighters and torches, electron cathodes, scintillators, GTAW electrodes, and other things. Lanthanum carbonate is used as a phosphate binder in cases of renal failure.

Names and Identifiers

Chemical Formula:La
Molecular Weight:138.90500 g/mol
EC Number :231-099-0
MDL Number:MFCD00011066
Color:silvery white
Other Names:Lanthane, Lantanio, Lantânio
PubChem CID:23926
IUPAC Name:Lanthanum
Canonical SMILES:[La]
ICSC Number:n/a

Physical & Chemical Properties

Density:6.162 g/cm³
Boiling Point:3737 K ​(3464 °C, ​6267 °F)
Melting Point:1193 K ​(920 °C, ​1688 °F)
Molecular Formula:La
Flash Point:n/a
Exact Mass:138.90600
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H260
Precautionary Statements:P222-P223-P231 + P232-P370 + P378-P422
Hazard Codes:F,T
Risk Phrases:R11
Safety Phrases:S26-S27-S36/37/39-S45-S33-S16-S23
RIDADR:UN 3264 8/PG 3
WGK Germany:3
Packaging Group:III
Hazard Class:4.1

Naturally occurring lanthanum is made up of two isotopes, the stable 139La and the primordial long-lived radioisotope 138La. 139La is by far the most abundant, making up 99.910% of natural lanthanum

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
138La137.907105 (6)0.090 (1)53.7139
139La138.906347 (5)99.910 (1)7/22.7832

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
132La131.910114.8 hEC to 132Ba2
133La132.90843.91 hEC to 133Ba5/2
134La133.908496.5 mEC to 134B1
135La134.9069719.5 hEC to 135Ba5/2
136La135.90779.87 mEC to 136Ba1
137La136.9064760000 yEC to 137Ba7/22.70
140La139.9094731.678 dβ to 140Ce3
141La140.9109583.90 hβ to 141Ce7/2
142La141.914081.54 hβ to 142Ce2

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