Why 5d series have higher ionization enthalpies than4d series?
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Why is the ionization enthalpy of 5D greater than 3D? In the 5d-series of transitions elements, after lanthanum (La), the added electrons go to the next inner 4f orbitals. The 4f electrons have poor shielding effect. ... This leads to higher ionisation energies for the 5d- series of transition elements.
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