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

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

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

APPLE VARITIES

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?

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.

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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