- a. The number of protons in a nucleus is indeed defined as the atomic number (Z) of an element. This number uniquely identifies the element. - b. The total number of protons and neutrons in an atomic nucleus is defined as the mass number (A). Mass number (A) = Number of protons (Z) + Number of neutrons (N). - Since the question asks which statement(s) is/are incorrect, and both are correct, the correct option is that neither is incorrect.
Which one of the following statements is/ are incorrect ? a. The number of protons in a nucleus is called its atomic number. b. The total number of protons and neutrons constitute its mass number.
Asked in MPSC CS Prelims 2016 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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