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Name the elements represented by followi...

Name the elements represented by following symbols : Hg , Pb , Au , Ag, Sn

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Electronic configuration of `Mn^(2+) : [Ar]3d^5` which is half-filled and hence stable configuration. Therefore `3^(rd)` Ionization enthalpy is high i.e. `31^@` electron cannot be lost easily. In case of `Fe^(2+)`, electronic configuration is `3d^6`. Hence it can lose one electron easily to give stable electronic configuration `3d^5`.
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