D-And F-Block Elements Ques 420
Question: 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 ionization enthalpy
[CBSE PMT 2005]
Options:
A) Vanadium (Z = 23)
B) Chromium (Z = 24)
C) Iron (Z = 26)
D) Manganese (Z = 25)
Show Answer
Answer:
Correct Answer: D
Solution:
$ _{25}Mn=3d^{5}4s^{2} $ After losing two electron electronic configuration will be like this $ _{25}M{{n}^{++}}3d $ and this is most stable configuration due to half filled orbitals hence third ionization enthalpy will be highest in this case.
