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

Question

The decreasing order of second ionization energy of K, Ca and Ba is (A) K > Ca > Ba (B) Ca > Ba > K (C) Ba > K > Ca (D) K > Ba > Ca

Tardigrade Admin · Accepted Answer

The second ionization energy of K is maximum, because the second electron is removed from 3s23p6 shell. The second ionization energies of group 2 elements decrease down the group. Hence, second I.E. of Ca > second I.E. of Ba.

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

K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

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