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Question
Answer the following question:
Which element of the first transition series has highest third ionisation enthalpy?
Solution
Among the elements of first transition series zinc has the highest third ionisation enthalpy. Electronic configuration of zinc is: \[\ce{3d^10 4s^2}\]
After the loss of two electrons from 4s orbital, Z and +2 Ion acquires \[\ce{3d^10}\] fully filled configuration which is highly stable therefore removal of third electron from \[\ce{3d^10}\] orbital will be more difficult and requires a large amount of energy.
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