Question
Question: Four successive members of first row transition elements are listed below with their atomic numbers....
Four successive members of first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy –
A
Iron (Z = 26)
B
Chromium (Z = 24)
C
Manganese (Z = 25)
D
Vanadium (Z = 23)
Answer
Manganese (Z = 25)
Explanation
Solution
Mn has 3d5, 4s2 configuration. Removal of third election will be from half filled 3d. Note that energy shell also changes.