Element Terbium

Terbium ElementIt is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife.
Terbium is a chemical element with the symbol Tb and atomic number 65
Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime, and euxenite.

Names and Identifiers

Chemical Formula:Tb
Molecular Weight:158.925g/mol
EC Number :231-137-6
MDL Number:MFCD00011256
Color:silvery-gray/ silvery white
Other Names:Terbio, Térbio
PubChem CID:23958
IUPAC Name:Terbium
Canonical SMILES:[Tb]
ICSC Number:n/a

Physical & Chemical Properties

Density:8.23 g/cm³
Boiling Point:3396 K ​(3123 °C, ​5653 °F)
Melting Point:1629 K ​(1356 °C, ​2473 °F)
Molecular Formula:Tb
Flash Point:n/a
Exact Mass:158.925293
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228
Precautionary Statements:P210
Hazard Codes:F,T
Risk Phrases:R11-34-23/24/25
Safety Phrases:S22-S24/25-S36/37/39-S33-S16-S45-S28-S27-S26
RIDADR:UN 3089 4.1/PG 2
WGK Germany:3
Packaging Group:III
Hazard Class:8

Naturally occurring terbium is composed of its only stable isotope, terbium-159; the element is thus called mononuclidic and monoisotopic.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
159Tb158.925342 (4)1003/22.014

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
153Tb152.9234332.34 dEC to 153Gd5/23.5
154Tb153.0246921.5 hEC to 154Gd; β to 154Dy00.9
155Tb154.923505.3 dEC to 155Gd3/22.0
156Tb155.9247445.3 dEC to 156Gd; β to 156Dy31.4
157Tb156.924021110 yEC to 157Gd3/22.0
158Tb157.925410180 yEC to 158Gd; β to 158Dy31.76
160Tb159.92716472.3 dβ to 160Dy31.79
161Tb160.9275666.91 dβ to 161Dy3/22.2

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