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Question

How many unpaired electrons are present in $$Mn^{2+}$$ ion?

Solution
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Atomic number of $$Mn$$ is :
$$[Ar] 3d^5 4s^2$$
Therefore the electronic configuration of $$Mn^{2+}$$ is : $$[Ar] 3d^5$$

As there are five 3d orbitals each orbital occupied with single electron.
Hence, there are 5 unpaired electrons in $$Mn^{2+}$$

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