Question

Question 3.25 Would you expect the first ionization enthalpies for two isotopes of the same element to be the same or different? Justify your answer.

Class XI Classification of Elements and Periodicity in Properties Page 94

Answer 1

Ionisation enthalpy depends upon electronic configuration of element and effective nuclear charge of that element . by this concept , we can say that
first Ionisation enthalpies of two isotopes of the same element are expected to be same . because isotopes have same electronic configuration and thus, the same nuclear charge.

Answer 2

Answer: Ionization enthalpy of any atom relies on its number of protons and electrons. But, the isotopes of any element have equal number of electrons and protons. Thus, the 1st ionization enthalpy of two isotopes of a single element is same.