Chemistry / Chem 0235 · Atom · ~20 seconds
Average Atomic Mass as a Weighted Average
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An element's average atomic mass is the weighted average of its isotopes' masses, each weighted by its fractional abundance.
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Boron's average mass comes from combining its two isotopes' masses in proportion to how much of each isotope occurs in nature.
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No single boron atom has this average mass — every real atom weighs close to one isotope's mass, never the blend.