Abstract
The lanthanides have fourteen 4ƒ electrons successively added to the lanthanum, La, configuration. These elements are highly electropositive and form a very stable tripositive cation, Ln3+, as their primary oxidation state. The radius of these ions decrease with increasing atomic number in a trend known as the lanthanide contraction. The elements are highly electropositive because the sum of the first three ionization enthalpies is relatively low. They easily form +3 ions in solids, such as oxides, and in complexes while existing as [Ln(H2O)n]3+ in aqueous solution. Other oxidation states are also possible, for example, Ce4+, Sm2+, Eu 2+, and Yb2+ are all stable in aqueous solutions and in solids.
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Luján-Upton, H., Okamoto, Y. (1990). Investigation of the Ion-Binding Properties of Tactic Poly(Methacrylic Acids) Using Terbium (III) Ion as a Fluorescent Probe. In: Pittman, C.U., Carraher, C.E., Zeldin, M., Sheats, J.E., Culbertson, B.M. (eds) Metal-Containing Polymeric Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0669-6_30
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