Classification Of Elements And Periodicity In Properties Ques 201
Question: Which of the following has least ionization potential [CPMT 1982, 93]
Options:
A) Li
B) Cs
C) Cl
D) I
Show Answer
Answer:
Correct Answer: B
Solution:
$ Li $ and $ A_2B_3 $ belong to Ist group but $ Cs $ has larger size, hence low nuclear attraction force, thus low ionization energy.
