1. Tardigrade
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  3. Chemistry
  4. The electronic configuration of a dipositive ion M2+ is 2, 8, 14 and its mass number is 56. The number of neutrons present is

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Q. The electronic configuration of a dipositive ion $ {{M}^{2+}} $ is $2, 8, 14$ and its mass number is $56$. The number of neutrons present is

ManipalManipal 2008Structure of Atom

Solution:

Number of electrons in $ {{M}^{2+}}=24 $
$ \therefore $ number of electrons in $ M=26 $
i.e., atomic number $ (Z)=26 $
Mass number $ (A)=56 $
$ \therefore $ number of neutrons
$ =A-Z=56-26=30 $ .