The first ionisation energies of the elements of the first transition series:
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a
increase as the atomic number increase.
b
decrease as the atomic number increase.
c
do not show any change as the addition of electrons takes place in the inner (n - 1) d-orbitals.
d
increase from Ti to Mn and then decrease from Mn to Cu.
answer is A.
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Detailed Solution
First ionisation energies of 3d-series (first transition series) increase with increase in atomic number due to (i) increase in nuclear charge (ii) decrease in atomic size.