Question

The atomic mass unit (u) is defined as:

Options

• One-twelfth of the mass of a carbon-12 atom

• The mass of one proton

• The mass of one hydrogen atom

• One-sixteenth of the mass of an oxygen-16 atom

Answer 1

A different mass unit used for expressing atomic masses is the atomic mass unit (u). It is defined as one-twelfth of the mass of a carbon-12 atom: \[1~\mathrm{u} = \frac{\text{mass of one }^{12}\mathrm{C}~\text{atom}}{12}\].