Atomic number of a nucleus is \( \mathrm{Z} \) and atomic mass is \( M \). The number of neutron...

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Atomic number of a nucleus is \( \mathrm{Z} \) and atomic mass is \( M \). The number of neutron is
(A) \( M-Z \)
(B) \( M \)
(C) \( Z \)
(D) \( M+Z \)
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