The uncle of which one of the following pairs of nuclei are isotones :-
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Isotone means same numbers of neutron (N) but difference proton number (Z) i.e. 
are equal.
For pair 
each one has same number of neutron i.e. 40
Hence they are isotone.
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