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Question
Answer the following question:
Which element of the first transition series has highest second ionisation enthalpy?
Solution
Out of all the elements of the first transition series copper has the highest second ionisation enthalpy.
Electronic configuration of Copper is: \[\ce{3d^10 4s^1}\]
After the Loss of first electron from the 4s copper acquires \[\ce{3d^10}\] configuration which is stable. Therefore, removal of second electron from the field 3-D orbital is very difficult and requires high amount of energy.
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