Question

Which of the following order for ionization energy is correct?

• A. $Be>B>C>N>O$
• B. $B<Be<C<O<N$
• C. $B<Be<C<N<O$
• D. $B<Be<N<C<O$

Answer 1

The correct option is B $B<Be<C<O<N$

Along a period the IE decreases but group 13 has lower IE than group 12 also, group 15 has lower IE than group 16.

$\therefore$ Correct order is $B<Be<C<O<N$.