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Atomic Mass

Atomic Mass. Atomic Mass. The weighted average of all natural occurring isotopes of that element Example: Lithium = 6.941 amu Atomic number closest to 7, therefore most isotopes of lithium of a mass number of 7. Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of

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Atomic Mass

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  1. Atomic Mass

  2. Atomic Mass • The weighted average of all natural occurring isotopes of that element • Example: Lithium = 6.941 amu • Atomic number closest to 7, therefore most isotopes of lithium of a mass number of 7

  3. Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of • 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average • atomic mass of rubidium?

  4. .722 x 85 (%) times (mass number) + .278 x 87 (%) times (mass number) = 85.55

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