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3 Μαΐ 2019 · The lanthanides are a group of 15 chemical elements, with atomic numbers 57 through 71. All of these elements have one valence electron in the 5d shell. The elements share properties in common with the first element in the group -- lanthanum. The lanthanides are reactive, silver-colored metals.
30 Ιουν 2023 · The Lanthanides consist of the elements in the f-block of period six in the periodic table. While these metals can be considered transition metals, they have properties that set them apart from the rest of the elements.
Lanthanides are 14 metallic elements with atomic numbers 57–70, filling the 4f orbitals in the periodic table. They have similar chemical properties, form trivalent cations, and are often called rare earths. Learn about their history, etymology, and natural and synthetic sources.
4 Φεβ 2021 · Learn about the 15 elements of the lanthanide series, their common properties, uses, and sources. The lanthanides are silver-colored, reactive metals that form compounds with various colors and applications.
Definition. According to IUPAC rules, elements 57–71 (Ln = La-Lu) should be called “lanthanoids,” and when the series is completed by Sc (21) and Y (39), it takes the name of “rare earths” (Fig. 1). Lanthanides, Physical and Chemical Characteristics, Fig. 1.
Lanthanides are a group of 13 metals that occur closely associated in nature with very similar chemical properties. To this group, an additional member, europium, does not occur in nature and the group adds to 14. Closely related to these 14 metals are scandium, yttrium, and lanthanum as shown in (Fig. 1).
23 Απρ 2024 · The properties of the metals are tabulated, their preparations, and the common oxidation states of their ions are discussed. The extraction of the lanthanides from their mineral sources and their separation by solvent extraction are described.
