the weighted average of its naturally occurring isotopes. chemical name atomic # chemical symbol...

Average Atomic Mass

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Average Atomic Mass

The weighted average of its naturally occurring isotopes.

Average Atomic Mass

Chemical NameAtomic #

Chemical Symbol

Atomic Mass(Average Atomic Mass)

Multiply the mass of each isotope by its abundance to get the weighted average.

Average Atomic Mass

100

.....)(%)(% massmass

Page 4: The weighted average of its naturally occurring isotopes. Chemical Name Atomic # Chemical Symbol Atomic Mass (Average Atomic Mass)

Boron is 80.20% boron-11 (atomic mass 11.01 amu) and 19.80% boron-10 (atomic mass 10.01 amu). What is the average atomic mass of boron?

Example

100

01.1080.1901.1120.80

01.101980.001.118020.0

amu81.10

Page 5: The weighted average of its naturally occurring isotopes. Chemical Name Atomic # Chemical Symbol Atomic Mass (Average Atomic Mass)

Neon has 2 isotopes. Neon-20 has a mass of 19.992 amu. Neon-22 has a mass of 21.991 amu. In an average sample of neon atoms, 90%

will be neon-20 and 10% will be neon-22. Calculate the average atomic mass.

Example

100

991.2110992.1990amu192.20

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