Question

The first ionization enthalpies for three elements are 1314, 1680 and 2080 kJ mol^–1, respectively. 

The correct sequence of the element is : 

 (A) O, F and Ne 

(B) F, O and Ne 

 (C) Ne, F and O 

(D) F, Ne and O

Answer 1

Correct option (A) O, F and Ne

Explanation:

First ionisation enthalpies for three elements are 1314, 1680, 2080. These are in increasing order so elements should be O, F, Ne