Here
are the answers for the two ions:
1.
For K+, this would be the answer: Zeff
= 19 - (0.35(7) + 0.85(8) +2) = 7.75
2. For CI-, Zeff = 17 - (0.35(7) + 0.85(8) +2) = 5.75
I am hoping that these answers have satisfied your queries and
it will be able to help you.