Question
Mon August 18, 2008 By:

Why 1st ionisation energies of 5d elements are higher than those of 3d or 4d elements

Expert Reply
Wed August 20, 2008

1st ionisation energies of 5d elements are higher than those of 3d or 4d elements this is due to the greater effective nuclear charge acting on outer valence electrons because of weak shielding by 4f electrons.

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