One atomic mass unit (amu) is a mass unit equal to exactly one-twelfth the mass of a July 22, 2024July 22, 2024 CSS MPT Chemistry MCQs FPSC NTS PPSC Past Papers Test Questions (A) carbon-8 atom(B) carbon-12 atom(C) carbon-16 atom(D) carbon-20 atom The answer is: (B) carbon-12 atom