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ytterbium n. 镱 镱 ytterbium 镱 YB ytterbium n 1: a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime [synonym: {ytterbium}, {Yb}, {atomic number 70}] Ytterbium \Yt*ter"bi*um\, n. [NL., fr. Ytterby, in Sweden. See {Erbium}.] (Chem.) A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. {Yttrium}. [1913 Webster] Note: Ytterbium is associated with other rare elements, and probably has not been prepared in a pure state. [1913 Webster] ytterbium Symbol: Yb Atomic number: 70 Atomic weight: 173.04 Silvery metallic element of the lanthanoids. Seven natural isotopes and ten artificial isotopes are known. Used in certain steels. Discovered by J.D.G. Marignac in 1878.
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