Question

An atomic mass unit is defined as precisely ___ the mass of one atom of carbon-12 isotope.

• A. ${\frac{1}{5}}^{th}$
• B. ${\frac{1}{10}}^{th}$
• C. ${\frac{1}{12}}^{th}$
• D. ${\frac{1}{14}}^{th}$

Answer 1

The correct option is C

${\frac{1}{12}}^{th}$

An atomic mass unit is defined as precisely ${\frac{1}{12}}^{th}$ the mass of one atom of carbon-12 isotope.

This is the universally accepted as atomic mass unit or amu.