Question

Define avarage atomic mass ?

Answer 1

The average atomic mass of an element is the sum of the massesof its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atomsof that element that are of a given isotope).

Answer 2

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The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element. Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.