Nuclei - Result Question 6

6. The nuclei of which one of the following pairs of nuclei are isotones?

[2005]

(a) $ _{34} Se^{74}, _{31} Ga^{71}$

(b) $ _{38} Sr^{84}, _{38} Sr^{86}$

(c) $ _{42} Mo^{92}, _{40} Zr^{92}$

(d) $ _{20} Ca^{40}, _{16} S^{32}$

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Answer:

Correct Answer: 6. (a)

Solution:

  1. (a) Isotones means equal number of neutrons i.e., $(A-Z)=74-34=71-31=40$.