Question

First ionisation enthalpy of two elements x and y are 500 kJ and 375 kJ respectively. Comment about their relative position in a group as well as a period

Answer 1

y is below x in group as its first ionization enthalpy is higher due to its small size and high effective nuclear charge 

Answer 2

Answer-: X should be above Y in group and should be on right side of Y in a period

Explanation-: because ionisation enthalpy or ionisation potential decreases down the group and increases across a period