Question

The mass number of an atom of carbon (C) represents the total number of
(A)protons and neutrons in the atom.
(B)neutrons and electrons in the atom.
(C)protons in the atom.
(D)electrons in the atom.

Answer 1

Answer:

Answer is option (a)Total number of protons and neutrons in the atom

Answer 2

(A)protons and neutrons in the atom.

The mass number (symbol A, from the German word atomic weight also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units. Since protons and neutrons are both baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element. Hence, the difference between the mass number and the atomic number Z gives the number of neutrons (N) in a given nucleus: N = A − Z

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