Answer:
Electron configuration of\[{{M}^{2+}}\]is 2, 8, 14 Mass number \[(A)=56\] Number of neutrons \[(n)=?\] We know that\[n=AZ\] How to get Z? Z = No. of protons = No. of electrons in the neutral atom\[=24+2=26\] \[\therefore \] \[n=56-26=30.\] Therefore, the no. of neutrons present in \[{{M}^{+2}}\]is 30.
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