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NEET UG PHYSICS MCQ: NUCLEI

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Understanding +4 | -1
The nuclei of which of the following pairs of nuclei are isotones
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Correct option: A
34Se74,  31Ca71_{34}S{e^{74}},\,{\,_{31}}C{a^{71}}
Option A (34Se74,  31Ca71_{34}S{e^{74}},\,{\,_{31}}C{a^{71}}) is correct because both nuclei have the same number of neutrons (40).

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