Question

The correct order of the first ionization enthalpies is ______.

Options

• Ti < Mn < Zn < N

• Zn < Ni < Mn < Ti

• Mn < Ti < Zn < Ni

• Ti < Mn < Ni < Zn

Answer 1

The correct order of the first ionization enthalpies is Ti < Mn < Ni < Zn.

Explanation:

Ionization enthalpy is the energy required to remove the outermost electron from an atom. In transition elements, it generally increases across a period due to increasing nuclear charge. However, due to irregular filling of d-orbitals, some exceptions occur. Here’s the correct increasing order of first ionization enthalpies for the given elements: Ti < Mn < Ni < Zn. Titanium (Ti) has the lowest ionization enthalpy. Zinc (Zn) has the highest because its d-subshell is fully filled (3d¹⁰) and is more stable.