Question

Atomic mass is defined as:

• A. 1/12^th the mass of carbon atom C-16.
• B. 1/12^th the mass of carbon atom C-13.
• C. 1/12^th the mass of carbon atom C-12.
• D. 1/12^th the mass of carbon atom C-14.

Answer 1

The correct option is C

1/12^th the mass of carbon atom C-12.

Atomic mass is defined as ${\frac{1}{12}}^{th}$ the mass of C-12 atom.

The atomic mass (m_a) is the mass of an atomic particle. It is commonly expressed in unified atomic mass units (u) where by international agreement, 1 unified atomic mass unit is defined as ${\frac{1}{12}}^{th}$ of the mass of a single carbon-12 atom (at rest).