Question

63.
09
For the second period elements the correct
increasing order of first ionisation enthalpy is:
(1). Li < Be <B<C<O<N<F < Ne
(2) Li < Be <B<C<N<O<F< Ne

(3) Li < B < Be <C<O<N<F< Ne
(4) Li<B< Be <C<N<O<F< Ne​

Answer 1

Answer:(3)

Explanation:

Ionisation enthalpy increases across a period.

Only position of second and third,

and fifth and sixth elements have to be interchanged

(Due to stability of full and half filled shells.)