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The atomic numbers of vanasium (V) Chorm...

The atomic numbers of vanasium (V) Chormium (Cr), manganese (Mn) and iron (Fe) respectively `23, 24, 25` and 26.which one of these may be expected to have the higher seconds ionization enthalpy ?

A

V

B

Cr

C

Mn

D

Fe

Text Solution

Verified by Experts

The correct Answer is:
B
`V rArr 1s^2 2s^2 2p^6 3 s^2 3p^6 3d^3 4s^2`
`Cr rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1`
`Mn rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2`
`Fe rArr 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2`
In second ionization enthalpy `Cr^(+)` has exact half filled d-sub shell.
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