Ionisation energies three hypothetical elements are given below (in kJ/mole) :   `{:(,I,II,III)
Channel: Doubtnut
Date: 26/04/2020

Ionisation energies three hypothetical elements are given below (in kJ/mole) :   `{:(,I,II,III),(X,122,340,1890),(Y,99,931,1100),(Z,118,1220,16552):}`   Which of the following pairs represents elements could be of the same group?