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Q. Among the following transition elements, pick out the element/elements with highest second ionization energy.
(A) $V ($ At. no $=23)$
(B) $Cr ($ At. no $=24)$
(C) $Mn ($ At. no $=25)$
(D) $Cu ($ At. no $=29)$
(E) $Zn ($ At. no $=30)$

Classification of Elements and Periodicity in Properties

Solution:

Because of stable configuration in $+1$ state.