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Isotopes

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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? – PowerPoint PPT presentation

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Title: Isotopes


1
Isotopes
2
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

3
Atomic Mass Formula
( Mass Abundance) (Mass Abundance)
4
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

5
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?
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