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The decreasing order of the second ionis...

The decreasing order of the second ionisation potential of K , Ca and Ba is
(At. No : K = 19 , Ca = 20 , Ba = 56)

A

KgtCagtBa

B

CagtBagtK

C

BagtKgtCa

D

KgtBagtCa

Text Solution

Verified by Experts

The correct Answer is:
A
`IE_(2)` of K is much higher than those of Ca and Ba because in case of K, the second electron has to be removed from noble gas (argon) core while this is not so in case of Ca and Ba. Out of ca and Ba the `IE_(2)` of Ca is higher than that of Ba due to smaller size. the overall sequence is KgtCagtBa
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