Oddo-Harkins rule
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Oddo-Harkins rule — See also: Isotope#Even and odd The Oddo Harkins rule holds that elements with an even atomic number (such as carbon) are more common than elements with an odd atomic number (such as nitrogen). Contents 1 Definition 2 Exceptions to the rule … Wikipedia
Holmium — (pronEng|ˈhoʊlmiəm) is a chemical element with the symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a relatively soft and malleable silvery white metallic element, which is stable in dry air at room temperature. A rare… … Wikipedia
Lanthanoid — The lanthanoid (according to IUPAC terminology) (previously lanthanide) series comprises the 15 elements with atomic numbers 57 through 71, from lanthanum to lutetium. [ [http://www.iupac.org/reports/periodic table IUPAC Periodic Table] ] [ [http … Wikipedia
Ytterbium — Yb redirects here. For the unit of information, see Yottabit. thulium ← ytterbium → lutetium ↑ Yb ↓ No … Wikipedia
Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare … Wikipedia
