For most practical purposes, lutetium can be regarded as stable, though it is slightly radioactive. 97.41% of lutetium found in nature is stable, and 2.59% is of an isotope with a half life of 37,800,000,000 years. Like all other elements, lutetium has synthetic radioactive isotopes.
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Yes, lutetium is a rare earth element that has a stable form (lutetium-175), but it also has several radioactive isotopes. However, the most common isotope of lutetium found in nature (lutetium-175) is stable and not radioactive.
If you think to the electron configuration of lutetium this is: [Xe]4f14.5d1.6s2.
Lanthanum and actinium belong to group III, while lutetium and lawrencium do not. Lutetium and lawrencium belong to the lanthanide and actinide series, respectively.
Lutetium's compounds always contain the element in the oxidation state +3. Lutetium metal is slightly unstable in air at standard conditions, but it burns readily at 150 °C to form lutetium oxide. In reaction with water it is slow when cold and fast when hot; lutetium hydroxide is formed in the reaction. All halide salts (except fluoride) are soluble in water. Lutetium dissolves readily in weak acids and dilute sulfuric acid to form solutions containing the colorless lutetium ions, which exist as a [Lu(H2O)9]3+ complex (nonate, hydrate) ions.
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