alleryStart learning →Ionization enthalpies of third-row transition elements are high mainly because of
Alack of nuclear charge
Babsence of d electrons
Cvery large atomic size
Dpoor 4f orbital shielding
Answer & Solution
Correct answer: D. poor 4f orbital shielding
The 4f orbitals shield poorly because of their diffused shape, so valence electrons feel a greater nuclear attraction.
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