Correct option is D
The correct answer is: (d) Atomic mass unit Explanation: amu stands for atomic mass unit, a standard unit used to express atomic and molecular masses. It is defined as 1/12th of the mass of a carbon-12 atom.
Information Booster:
· 1 amu ≈ 1.66 × 10⁻²⁷ kg.
· It simplifies comparison of relative atomic masses.
· Now more precisely called Unified Mass Unit (u).
· Commonly used in mass spectrometry and chemistry.
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