Pick out the wrong statement?

A. Out of ?, ?, and ?-rays, the one having maximum penetration power are ?-rays

B. Atoms with same number of nucleons but different number of protons are called isobars

C. The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide

D. Atoms with same number of protons but different number of nucleons are called isoters
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