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  4. The decreasing order of second ionization energy of K, Ca and Ba is

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Q. The decreasing order of second ionization energy of K, Ca and Ba is

NTA AbhyasNTA Abhyas 2022

Solution:

The second ionization energy of K is maximum, because the second electron is removed from $3s^{2}3p^{6}$ shell. The second ionization energies of group 2 elements decrease down the group. Hence, second I.E. of Ca > second I.E. of Ba.