Question

Which of the following details from is represented by the atomic mass of an element? A. Only the neutrons in the atom's nucleus B. Only the protons in the atom's nucleus C. the sum of all protons and neutrons in the atom's nucleus D. The sum of all electrons in the atom's electron cloud    PlEASE HURYYYYYYYYYYYYYYYYYYYYYYYYYYYY  IM FAILING 

Answer 1

C. the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.