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Why does first ionisation enthalpy rise only slightly across the 3d series?
ANuclear charge stays constant
B4s electrons shield 3d electrons
C3d electrons shield 4s electrons
DAtomic radii rise steadily
Answer & Solution
Correct answer: C. 3d electrons shield 4s electrons
Added 3d electrons screen the outer 4s electrons from the growing nuclear charge, so radii and ionisation enthalpies change little.
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