Question: The element rubidium (Rb) has two naturally occurring isotopes, 85 Rband 87 Rb. In your own words , explain how you could determine which isotope

  1. The element rubidium (Rb) has two naturally occurring isotopes, 85Rband 87Rb.
    1. In your own words, explain how you could determine which isotope is the most abundant if you were not provided ANY other data than your periodic table. NO calculations required. (2 pts)

b. Provided with the information that Rubidium is 72.17% in 85Rb and the atomic mass of 85Rb is

84.911790 u, calculate the mass of 87Rb.

Show all of your work for full marks, and watch sig figs and units.

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