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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.
