Which element from following has lowest ionization enthalpy $\left(\mathrm{IE}_1\right)$ ?

Which element from following has lowest ionization enthalpy $\left(\mathrm{IE}_1\right)$ ?
  1. Cu
  2. Sc
  3. Mn
  4. Zn

Solution

The ionization enthalpy $\left(\mathrm{IE}_1\right)$ of the elements of the 3 d transition series increases gradually from left to right with some irregularities. Therefore, among the given elements, Sc has the lowest ionization enthalpy $\left(\mathrm{IE}_1\right)$.

Asked in: MHT CET 2024 (11 May Shift 1)

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