Atomic mass — task. Chemistry CBSE Live product, Class 9 (2025-26).

Select the correct answer:

What is the modern definition of \(1\) unified atomic mass unit (\(u\))?

One-sixteenth the mass of an oxygen - \(16\) atom
One-twelfth the mass of a carbon - \(12\) atom
The mass of a hydrogen atom
The average mass of all elements

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