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 ionisation enthalpy?
(1) Vanadium (Z = 23) (2) Chromium (Z = 24
(3) Manganese (Z = 25) (4) Iron (Z = 26)

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Answer 1

Answer:

(3) is right answer. Manganese have highest third ionisation enthalpy.

Explanation:

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Answer 2

Answer:

manganese(Z=25)

explanation:

Because,after removing 2 electrons from manganese it has the electronic configuration of 3d5 and 4s2 which is more stable than other following elements.and it becomes half filled d shell which makes more stable.hence manganese has highest 3rd ionisation enthalpy