Ytterbium is a chemical element with the symbol Yb and atomic number 70.

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It is a metal, the fourteenth and penultimate element in the lanthanide series. Ytterbium clocks hold the record for stability with ticks stable to within less than two parts in 1 quintillion (2×10−18).

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Keywords: 70, chemical, element, elements, lanthanide, series, yb, ytterbium