A) Their ionisation potential would increase with increasing atomic number
B) B would have an ionisation potential between those of A and C
C) C would have the highest ionisation potential
D) B would have the highest ionisation potential
Correct Answer: B
Solution :
Elements A B and C with atomic numbers 19, 37 and 55 lie in group 1 (alkali metals). Within a group, IE decreases from top to bottom. Thus, IE of B could be between A and C.
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