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D and F Block Elements question

2005 · Q102
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D and F Block Elements question

2005 · Q102

NEETChemistryD and F Block ElementsMCQ+4 / −1
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
  1. A
    Vanadium (Z = 23)
  2. B
    Chromium (Z = 24)
  3. C
    Manganese (Z = 25)
  4. D
    Iron (Z = 26)
View written solutionFree

Correct answer: C

For third ionization enthalpy electronic configuration of

V2+ (21) : [Ar]18 3d34s0

Cr2+ (22) : [Ar]18 3d44s0

Mn2+ (23) : [Ar]18 3d54s0

Fe2+ (24) : [Ar]18 3d54s1

Mn has most stable configuration due to half filled d-orbital. Hence 3rd ionization energy will be highest for Mn.

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