First ionization enthalpy of two elements X and Y are 500 kJ mol−1 and 375 kJ mol−1respectively. Comment about their relative positive in a group as well as in a period.
Ionization Energy is the minimum energy required to remove the outermost electron from a gaseous neutral atom to form a cation.
The position of X will be above Y in a group. Because Ionization energy decreases down the group. In the period the position of X will be the right side of Y. Because Ionization energy increases from left to right in a period.