1.0 2015-02-28 11:55:34 UTC 2025-11-19 03:00:13 UTC FDB030055 Terbium Terbium, also known as 65tb or terbio, is a member of the class of compounds known as homogeneous lanthanide compounds. Homogeneous lanthanide compounds are inorganic compounds containing only metal atoms, with the largest atom being a lanthanide atom. Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime, and euxenite . Tb 158.9254 158.92535 terbium terbium 7440-27-9 [Tb] InChI=1S/Tb GZCRRIHWUXGPOV-UHFFFAOYSA-N belongs to the class of inorganic compounds known as homogeneous lanthanide compounds. These are inorganic compounds containing only metal atoms, with the largest atom being a lanthanide atom. Homogeneous lanthanide compounds Inorganic compounds Homogeneous metal compounds Homogeneous lanthanide compounds Homogeneous lanthanide f-block element atom lanthanoid atom logp 0 ChemAxon iupac terbium ChemAxon average_mass 158.9254 ChemAxon mono_mass 158.92535 ChemAxon smiles [Tb] ChemAxon formula Tb ChemAxon inchi InChI=1S/Tb ChemAxon inchikey GZCRRIHWUXGPOV-UHFFFAOYSA-N ChemAxon polar_surface_area 0 ChemAxon refractivity 0 ChemAxon polarizability 1.78 ChemAxon rotatable_bond_count 0 ChemAxon acceptor_count 0 ChemAxon donor_count 0 ChemAxon physiological_charge 0 ChemAxon formal_charge 0 ChemAxon Milk (Cow) Type 2 specific 0.05045 0.0648 0.0327 uM