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  2. Empirical formula - Wikipedia

    en.wikipedia.org/wiki/Empirical_formula

    Glucose (C 6 H 12 O 6), ribose (C 5 H 10 O 5), Acetic acid (C 2 H 4 O 2), and formaldehyde (CH 2 O) all have different molecular formulas but the same empirical formula: CH 2 O.This is the actual molecular formula for formaldehyde, but acetic acid has double the number of atoms, ribose has five times the number of atoms, and glucose has six times the number of atoms.

  3. Isotopes of potassium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_potassium

    The decay of 40 K to 40 Ar is used in potassium-argon dating of rocks. Minerals are dated by measurement of the concentration of potassium and the amount of radiogenic 40 Ar that has accumulated. Typically, the method assumes that the rocks contained no argon at the time of formation and all subsequent radiogenic argon (i.e., 40 Ar) was retained.

  4. Plutonium - Wikipedia

    en.wikipedia.org/wiki/Plutonium

    Plutonium is an element in which the 5f electrons are the transition border between delocalized and localized; it is therefore considered one of the most complex elements. [46] The anomalous behavior of plutonium is caused by its electronic structure.

  5. Nastia Liukin - Wikipedia

    en.wikipedia.org/wiki/Nastia_Liukin

    She is the 2008 Olympic all-around champion, a five-time Olympic medalist, the 2005 and 2007 World champion on the balance beam, and the 2005 World champion on the uneven bars. She is also a four-time all-around U.S. national champion, winning twice as a junior and twice as a senior.

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