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205. If the mass defect per nucleon of X is larger than the mass defect per nucleon of Y,
    
A. X has a larger binding energy per nucleon than Y but is less stable. E = mc2   

The mass defect is the mass converted into energy when the atom is made from its components.   A larger mass defect creates a larger binding energy.

The greater the binding energy per nucleon, the more stable the nucleus.

The Correct Answer is B.

B. X has a larger binding energy per nucleon than Y but is more stable.
C. X has a smaller binding energy per nucleon than Y but is less stable.
D. X has a smaller binding energy per nucleon than Y but is more stable.