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Electron-gain enthalpy value of Cu is ne...

Electron-gain enthalpy value of Cu is negative while that of Zn is positive explain?

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In Cu atom, there is only a single electron in the 4s subshell of the valence shell. When it gains another electron, it attain a stable electronic configuration of `3d^(10)4s^(2)`. However, in Zn, the 4s-subshell of valence shell is already filled with two electron. so, electron-gain enthalpy value of Cu is negative while that of Zn is positive.
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