The amu for an atom is the weighted average of all the naturally occurring isotopes.

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The amu (atomic mass unit) for an atom is the weighted average of all the naturally occurring isotopes, taking into account their relative abundance. This is because different isotopes of an element may have slightly different masses due to differences in the number of neutrons they contain. By taking the weighted average, scientists can calculate a more accurate atomic mass for the element.

The Amu for an Atom Is the Weighted Average of All