If a radioactive isotope with atomic number A and mass number M emits an \[\alpha \]-particle, the atomic number and mass number of that new isotope will become [NCERT 1980]

If a radioactive isotope with atomic number A and mass number M emits

1.	If a radioactive isotope with atomic number A and mass number M emits an \[\alpha \]-particle, the atomic number and mass number of that new isotope will become [NCERT 1980]
A.	A ? 2, M ? 4
B.	A ? 2, M
C.	A, M ? 2
D.	A ? 4, M ? 2
Answer» B. A ? 2, M

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If a radioactive isotope with atomic number A and mass number M emits an \[\alpha \]-particle, the atomic number and mass number of that new isotope will become [NCERT 1980]

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