Q19.
Ans: option (B).
How barium has higher I.E. than potassium?
Q.19. Decreasing ionization potential for K, Ca & Ba is
(A) Ba > K > Ca
(B) Ca > Ba > K
(C) K > Ba > Ca
(D) K > Ca > Ba
Dear Student,
Let us consider the electronic configuration of cations generated after removal of one electron from each K, Ca and Ba.
As we can see that, K will have completely filled outermost shell after removal of one electron. Therefore, removal of the electron will require less amount of energy. Thus, among the given elements K will have the lowest ionization energy.
Among Ca and Ba, Ca will have higher ionization energy, because ionization energy decreases on moving down the group.
Thus, the correct order of increasing second ionization energy is Ca> Ba > K.
Hope this information will clear your doubts regarding ionization energy.
In case of any doubt, just post your query on the forum and our experts will try to help you as soon as possible.
Let us consider the electronic configuration of cations generated after removal of one electron from each K, Ca and Ba.
Cation | Electronic Configuration |
K | 3s2 3p64s1 |
Ca | 3s2 3p6 4s2 |
Ba | 5s2 5p6 6s2 |
Among Ca and Ba, Ca will have higher ionization energy, because ionization energy decreases on moving down the group.
Thus, the correct order of increasing second ionization energy is Ca> Ba > K.
Hope this information will clear your doubts regarding ionization energy.
In case of any doubt, just post your query on the forum and our experts will try to help you as soon as possible.