Atomic mass

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  • (chemistry) The relative mass of an average atom of an element on a scale using the 126C atom as the reference.
  • (geology) The nucleus of an atom contains 99.95 percent of its mass. Total number of protons and neutrons in nucleus is called mass number.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall

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