A,BC,D and E are elements with atomic numbers 13,11,9,7 and 16 respectively. Among these elements, ion of an element X has largest size and ion of an element Y has smallest size. X and Y are respectively.(Assume that all ions have nearest inert gas configuration)
(i) Elements with atomic number 13,11,9,7 and 16 are aluminium, sodium, fluorine, nitrogen and sulphur respectively. Thus, largest ions is S2−, sulphide ion while smallest ion will be Al3+ ion. So, elements X and Y are E and A respectively.