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Average atomic Mass. What does the atomic mass tell us on the Periodic table?

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Presentation on theme: "Average atomic Mass. What does the atomic mass tell us on the Periodic table?"— Presentation transcript:

1 Average atomic Mass

2 What does the atomic mass tell us on the Periodic table?

3 Atomic Mass Weighted average of element’s natural isotopes Some isotopes are more abundant than others…. SO atomic mass leans towards more abundant mass

4 How do we calculate atomic mass? 1) Masses of Isotopes 2) Natural abundance of each isotope usually a percentage Average atomic mass = mass contributed by all isotopes Fraction of abundance (isotope mass) = mass from a particular isotope

5 Example 1 Neon has 3 natural isotopes. Ne-20 (90.51%, 19.99244 u) Ne-21 (0.27%, 20.99395 u) Ne-22 (9.22%, 21.99138 u) What is the weighted average atomic mass for Ne?

6 Example 2: A certain metallic element has two stable isotopes: M-45 and M-48. Given that the atomic weights are 45.0010 and 48.0014, respectively, what is the percent abundance of the lighter isotope if the average atomic weight of M is 47.2002?

7 Example 3: Calculate the atomic weight of chlorine if 75.77% of the atoms have a mass of 34.97 amu and 24.23% have a mass of 36.97 amu.

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