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You can understand that in simple terms that magnitude of ionisation energy of Cl is much greater than its electron affinity(ionisation energy of ($Cl^-$.). Since $Cl + e^- = Cl^-$ reverse of it is ionisation enthalpy of $Cl^-$. And with given reference it is verified. And you may also remember that for every element in periodic table have their ionization ...


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Aluminum and gallium are on different periods. When an additional shell is (fictitiously) added to aluminum, the size is seen to decrease. This is, as correctly mentioned, due to the poor shielding offered by the $(n-1)d$ orbitals to the incoming electrons in the ultimate $p$ subshell. However, between copper and zinc, the matter seems to be different–their ...


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