Problem: Which of the following choices lists a pair of isotopes?A. 146C and 147NB. 32He and 63LiC. 157N and 168OD. 31H and 21H

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Isotopes have the same atomic number but different nucleon number.

An element X is written as:


where A is the nucleon number and Z is the atomic number.

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Problem Details

Which of the following choices lists a pair of isotopes?

A. 146C and 147N
B. 32He and 63Li
C. 157N and 168O
D. 31H and 21H

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