Question
Physics Question on Nuclei
The nuclei of which one of the following pairs of nuclei are isotones?
A
34Se74, 31Ga71
B
42Mo92 , 40Zr92
C
38Sr84 , 38Sr86
D
20Ca40 ,16S32
Answer
34Se74, 31Ga71
Explanation
Solution
The isotones have same number of neutrons (N) but difference proton number (Z)
i.e , (A-Z)are equal
From the options 34Se74, 31Ca71 each one has same number of neutron i.e 40
Hence isotonic pair is of 34Se74, 31Ga71
Therefore, the correct option is (A): 34Se74, 31Ga71