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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules2 Marks
Question
Define the atomic mass unit.
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Answer

One atomic mass unit is equal to exactly one-twelfth $(1/12th)$ the mass of one atom of carbon $-12$. The relative atomic masses of all elements have been found with respect to an atom of carbon $-12$.

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