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Question

First ionization enthalpy of two elements X and Y are 500 kJ mol1 and 375 kJ mol1respectively. Comment about their relative positive in a group as well as in a period.


Solution

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.

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