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(C) The standard electrode potential $(E^o_{M^{2+}/M})$ for transition metals depends on the sum of enthalpy of sublimation,ionization enthalpy,and hy

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$Cu(Z=29)$

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(C) The standard electrode potential $(E^o_{M^{2+}/M})$ for transition metals depends on the sum of enthalpy of sublimation,ionization enthalpy,and hydration enthalpy. For most $3d$ transition metals,the value of $(E^o_{M^{2+}/M})$ is negative. However,for copper $(Cu)$,the high enthalpy of atomization (sublimation) is not compensated by the hydration enthalpy,resulting in a positive value of $(E^o_{M^{2+}/M} = +0.34 \ V)$. Therefore,the correct option is $Cu(Z=29)$.

Four successive members of the first series of the transition metals are listed below. For which one of them the standard electrode potential $(E^o_{M^{2+}/M})$ value has a positive sign?

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