Which one of the following pairs of nuclei are isotones? (a) 34Se74, 31Ga71 (b) 38Sr84, 38Sr86 (c) 42Mo92, 40Zr92 (d) 20Ca40, 16S32

Answer: (a). Isotones have the same neutron number N = A - Z. Se: 74 - 34 = 40; Ga: 71 - 31 = 40, equal. (b) are isotopes, (c) are isobars, (d) have N = 20 and 16. So the answer is (a).

Which one of the following pairs of nuclei are isotones? | NEET 2005 (AIPMT)

Q32NEET 2005 · AIPMTEasy

Nucleus: Composition, Size & Nuclear Force

Which one of the following pairs of nuclei are isotones?

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Answer: (a)

Isotones have the same neutron number $N = A - Z$ .
Se: $74 - 34 = 40$ ; Ga: $71 - 31 = 40$ , equal.
(b) are isotopes, (c) are isobars, (d) have $N = 20$ and $16$ .
So the answer is (a).

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