Which element has highest ionisation enthalpy in d block?
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Zn which has the highest ionisation enthalpy in 3d series. The reason given in my textbook is: The value of zinc is higher because it represent ionisation from 4s level. Increase in nuclear charge outweigh the electron electron repulsion of 4s electrons rendering Zn an higher ionisation enthalpy than Cu.
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zinc(zn) has highest ionization enthalpy bcz it represents ionization from 4s level
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