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Chemistry CBSE Live product
Class 9 (2025-26)
Atoms and molecules
Annual Revision IV - Atoms and molecules
1.
Atomic mass
Question:
1
m.
Choose the best answer:
Pranav says, “Atomic mass unit is \(1/16\) of the mass of an oxygen atom.” How would you guide them based on modern IUPAC standards?
They are correct; this is the global standard
It’s still based on oxygen in advanced research
The unit depends on the element being measured
That was used earlier, but now \(1 u = 1/12\) of a carbon - \(12\) atom
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