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A parent nucleus .n^mP decays into a dau...

A parent nucleus `._n^mP` decays into a daughter nucleus D through `alpha` emission in the following way . The subscript and superscript on the daughter nucleus D will be written as :

A

`n_D^m`

B

`N_D^(m+4)`

C

`n_D^(m-4)`

D

`n-2_D^(m-4)`

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The correct Answer is:
D
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