Question

Arrange the elements N, P, O and S in the order of:
(i) increasing first ionisation enthalpy.
(ii) increasing non-metallic character.
Given reason for the arrangement assigned.

Answer 1

Given,  

Elements Nitrogen, Phosphorus, Oxygen, and Sulfur.

(i) Increase in first ionization enthalpy:

We know that ionization energy (I.E) is directly proportional to the effective nuclear charge and inversely proportional to the size of the atoms. Hence, according to this concept the increase in order of Size is N < O < P < S.  

Hence, the first ionization energy will be in the order of S < P < O < N.

(ii) Increasing order of non-metallic character:

In the periodic table, from left to right, the non-metallic character increases and from top to bottom the non-metallic character decreases. So, the order of the given elements in the increasing order of non-metallic character is P < S < N < O.

Answer 2

Answer:

s<p<o<N

p<s<n<o

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