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Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
Give a brief description of the following: 
Atomic mass unit.
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Answer

An atomic mass unit is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons in its nucleus. It is represented as a.m.u or u (unified). It is a unit of mass used to express atomic masses.

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