Atomic numbers vs mass numbers: The mass number (A) of an atom equals what count of subatomic particles? Relate A to the composition of the nucleus (protons and neutrons). Choose the correct option.
IIT JEE
Chemistry
Difficulty: Easy
Choose an option
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AThe number of protons
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BThe number of protons and electrons
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CThe number of nucleons
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DThe number of neutrons
Answer
Correct Answer: The number of nucleons
Explanation
Concept/ApproachMass number A = total number of nucleons = protons + neutrons. Atomic number Z = protons only.
Final AnswerThe number of nucleons