The correct order of decreasing second ionisation enthalpy of 
, 
, 
and 
is
Text Solution
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Electronic configuration of the given elements are
In general ionization potential (both 1st and 2nd) increases from left to right across the period due to increase in effective nuclear charge. On this basis, the second IP values should exhibit the trend:
But the actual observed order is:
Practically, only chromium is exceptional and rest others show the normal trend. This exceptional behaviour of chromium is due to the stable configuration 
that it achieves after the loss of first electron.
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