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Question

Which of the following pair(s) of nucleides is/are isodiaphers?

A
126C and 168O
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B
11H and 21H
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C
31He and 42He
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D
5525Mn and 5224Cr
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Solution

The correct option is A 126C and 168O
Isodiaphers are the species with different atomic numbers and mass numbers, but with the same number of neutrons in excess.
Number of neutrons in 126C= 12 – 6 = 6. Number of protons = 6, (n - p) = 0
Number of neutrons in 168O = 16 – 8 = 8, number of protons = 8, (n - p) = 0
126C and 168O have different atomic numbers and different mass numbers, but the difference between neutrons and protons is same i.e. (n-p)

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