1. Tardigrade
  2. Question
  3. Chemistry
  4. The electronic configuration of elements A, B and C are [He]2s1,[Ne]3s1 and [Ar]4s1respectively Which one of the following order is correct for IE1(in kJ mol-1)of A, B and C?

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Q. The electronic configuration of elements A, B and C are $\left[He\right]2s^{1},\left[Ne\right]3s^{1}$ and $\left[Ar\right]4s^{1}$respectively Which one of the following order is correct for $IE_{1}\left(in kJ mol^{-1}\right)$of A, B and C?

Classification of Elements and Periodicity in Properties

Solution:

Electronic configuration of A, B, and C suggests that these are the successive members of a similar group. Ionisation energy decreases on moving down the group. Thus, it should follow the order: $A > \,B >\, C.$