NCERT · Class 9 · Science · Atoms and MoleculesWhat was the initial standard reference for atomic mass units?
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Step-by-Step Solution
Initially, 1/16th of the mass of an atom of naturally occurring oxygen was considered as the standard atomic mass unit.
Detailed Options Breakdown
Option : Hydrogen-1
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Atoms and Molecules.
Option 1: Carbon-12
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Atoms and Molecules.
Option 2: Oxygen-16 (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Nitrogen-14
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Atoms and Molecules.
💡 Study Guide: This question tests core syllabus concepts from Atoms and Molecules. For formulas, key summaries, and mock exam reference guides, read the full Atoms and Molecules Revision Notes.