electronic configuration of Mn2+ and Cr3+.4
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Electronic configuration of Mn2+ is 3d5. This is a half-filled configuration and hence stable. Therefore, third ionisation enthalpy is very high (i.e. third electron cannot be lost easily). Electronic configuration of Fe2+ is 3d6.
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In Mn2+ compounds the ion possess stable half electronic configuration of 3d5 whereas in Fe2+ compounds the ion has configuration 3d6. If it loses one electron it can attain the configuration 3d5 which is very stable.
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