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A nuclide A (with mass number m and atom...

A nuclide `A` (with mass number `m` and atomic number `n`) disintegrates emitting an alpha and one beta particle. The resulting nuclide B has mass number and atomic number respectively equal to

A

`m4` and `n2`

B

`m2` and `n`

C

`m+4` and `n+1`

D

`m-4` and `n-1`.

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