Page 188 - Radiation Safety
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10 Most Abundant Elements
Element Symbol Protons Relative % of
Earth’s Mass
Oxygen O 8 46.6
Silicon Si 14 27.7
Aluminum Al 13 8.1
Iron Fe 26 5.0
Calcium Ca 20 3.6
Sodium Na 11 2.8
Potassium K 19 2.6
Magnesium Mg 12 2.1
Titanium Ti 22 0.4
Hydrogen H 1 0.1
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