Question

The first ionization inthalpies for three elements are $1314,1680$ and $2080$ $kJmo{l}^{-1}$, respectively. The correct sequence of the elements is:

• A. $O,F$ and $Ne$
• B. $F,O$ and $Ne$
• C. $Ne,F$ and $O$
• D. $F,Ne$ and $O$

Answer 1

The correct option is A $O,F$ and $Ne$

As we move left to right in a period the ionization enthalpies increases due increase in nuclear force of attraction on outer electrons.

So the correct sequence of elements based on the ionization enthalpies is $O.F,Ne$.

Hence option A is correct.