Question

One Atomic mass unit is _______ times the mass of one atom of _____________.

• A. , Hydrogen
• B. , Carbon-14
• C. , Carbon-12
• D. , Sulphur

Answer 1

The correct option is C

, Carbon-12

One atomic mass unit is ${\frac{1}{12}}^{th}$ of the mass of one atom of carbon-12.

For the atomic mass, we consider C-12 isotope and not C-13 or C-14 isotopes.