Ionisation energies three hypothetical elements are given below (in kJ/mole) : `{:(,I,II,III),(X,122,340,1890),(Y,99,931,1100),(

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?
A. Y,Z
B. X,Y
C. X,Z
D. X,Y,Z

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):}` W

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