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ISOTOPES and RELATIVE ABUNDANCE What is an isotope? What is relative abundance?

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Presentation on theme: "ISOTOPES and RELATIVE ABUNDANCE What is an isotope? What is relative abundance?"— Presentation transcript:

1 ISOTOPES and RELATIVE ABUNDANCE What is an isotope? What is relative abundance?

2 What is an ISOTOPE? Isotope = atoms that have the same number of PROTONS but different number of NEUTRONS. chemically alike but with varying mass numbers

3 APPLE VARITIES

4 What is average atomic mass? Atomic Mass or Atomic Weight - average of the masses of its naturally occurring isotopes Related to the Relative Abundance Which apple variety is most abundant in the grocery store?

5 Calculating Average Atomic Mass EX. You have a box containing two sizes of marbles. 25% of the marbles have a mass of 2.0 g. 75% of the marbles have a mass of 3.0 g. Calculate the average weight of the marble.

6 EX. Copper has two naturally occurring isotopes: Cu-63 (69.17% abundant) with amu = 62.929 Cu-65 (30.83% abundant) with amu = 64.927 Calculate the average atomic mass.

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