Element Terbium
It 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 |
CAS: | 7440-27-9 |
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 |
Inchl: | InChI=1S/Tb |
InChI Key: | GZCRRIHWUXGPOV-UHFFFAOYSA-N |
Canonical SMILES: | [Tb] |
ICSC Number: | n/a |
Physical & Chemical Properties
Phase: | Solid |
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: | |
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 |
RTECS: | n/a |
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
Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
---|---|---|---|---|
159Tb | 158.925342 (4) | 100 | 3/2 | 2.014 |
Radiosotope data
Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
---|---|---|---|---|---|
153Tb | 152.923433 | 2.34 d | EC to 153Gd | 5/2 | 3.5 |
154Tb | 153.02469 | 21.5 h | EC to 154Gd; β– to 154Dy | 0 | 0.9 |
155Tb | 154.92350 | 5.3 d | EC to 155Gd | 3/2 | 2.0 |
156Tb | 155.924744 | 5.3 d | EC to 156Gd; β– to 156Dy | 3 | 1.4 |
157Tb | 156.924021 | 110 y | EC to 157Gd | 3/2 | 2.0 |
158Tb | 157.925410 | 180 y | EC to 158Gd; β– to 158Dy | 3 | 1.76 |
160Tb | 159.927164 | 72.3 d | β– to 160Dy | 3 | 1.79 |
161Tb | 160.927566 | 6.91 d | β– to 161Dy | 3/2 | 2.2 |