why are the 1st ionisation enthalpies of Zn ,Cd and Hg very high?
Answers
Since Zn, Cd and Hg does not have unpaired d-electrons hence they fall in exceptions. 2. The irregularity in Ionisation enthalpy (first and second) of first transition series is due to the irregular variation in atomic size. ... Since these states are exceptionally stable, their ionization enthalpies are very high.
Answer:
On the other hand, Zn has exceptionally high first ionization energy as an electron has to be removed from stable and fully-filled orbitals (3d10 4s2). Second ionization energies are higher than the first since it becomes difficult to remove an electron when an electron has already been taken out.
Explanation:
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