The correct order of the first ionization enthalpies is ______.

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KollegeApply · Accepted Answer

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.

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