Question

Arrange the elements N, P, O and S in the order of
() increasing first ionisation enthalpy.
increasing non-metallic character.​

Answer 1

Arrangement of N,P,O,S  increasing first ionisation enthalpy and non metallic character

Explanation:

• Nitrogen, phosphorous , oxygen and suplphur when arranged in  increasing order of first ionisation enthalpy , the sequence will be S<P<O<N.
• Ionisation enthalpy increases from left to right in a period and decreases down the group.
• Nitrogen has higher ionisation  enthalpy than oxygen due to half filled orbital which is extra stable.
• Phosphorous has higher ionisation enthalpy than S due to half filled orbitals.
• Non- metallic character decreases down the group and increases from left to right in a period, the sequence will be P<S<N<O