Isotopes.

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Presentation transcript:

Isotopes

Isotopes Are…. Atoms w/ same # of p+ but different # no different mass # s chemically alike- react the same way b/c identical # of p+ & e- Atomic Mass rounds to most abundant isotope

Atomic Mass Formula ( Mass* % Abundance) + (Mass * %Abundance)+…

Example 1 Mass (amu) x Abundance (%) = Relative Mass 35Cl 34.97 x 75.78 = 26.50 amu 100 + 37Cl 36.97 x 24.22 = 8.954 amu 100 Atomic mass of Cl = 35.45 amu

Example 2 Two isotopes of gallium are naturally occurring with 69Ga at 60.11% (68.93 amu) and 71Ga at 39.89% ( 70.92 amu). What is the atomic mass of gallium?