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The nuclei of which one of the following pairs of nuclei are isotones?
(a) 34Se74, 31Ga71
(b) 38Sr84, 38Sr86
(c) 42Mo92, 40Zr92
(d) 20Ca40, 16S32
(a)
Isotones means equal number of neutrons i.e.,
(A-Z) = 74 - 34 = 71 - 31 = 40.
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