Among the following transition elements, pick out the element/elements with highest second ionization energy
(a) V(At. No. 23) (v) Cr(At. No. 24)
(c) Mn(At. No. =25) (d) Cu (At. No. =29)
(e) Zn(At. No.=30)

Options

A. (A) and (C)
B. (B) and (D)
C. (B) and (E)
D. Only (D)

Answer

B

Explanation

`Cr_((24) rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1`
`Cr^(+) rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5` (stable half filled)
`:. IE_2` will be high.
`Cu_(29) rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^1`
`Cu^(+) rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10` (stable completely filled)
`:. IE_2` will be high.