Question

Which one of the following first row transition elements is expected to have the highest third ionization enthalpy?

• A. Iron (Z = 26)
• B. Manganese (Z = 25)
• C. Chromium (Z = 24)
• D. Vanadium (Z = 23)

Hint:

For transition elements, the ionization enthalpy increases across the period due to increased nuclear charge and stability of electronic configurations.

Answer 1

The Correct Option is B

Across a period, the third ionization enthalpy of transition elements rises due to escalating nuclear charge. Manganese (Z = 25), with its stable half-filled d-subshell, necessitates greater energy for third electron removal, resulting in its highest third ionization enthalpy.