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Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements. - Chemistry

Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.

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Solution

Nitrogen shows anomalous behaviour as follows:-

  1. Nitrogen is a gas, whereas the other members of the family are solids.
  2. Nitrogen is diatomic, while the other elements such as phosphorus and arsenic form tetra-atomic molecules (P4, As4).
  3. Nitrogen forms five types of oxides (N2O, NO, N2O3, N2O4 and N2O5), while the other members form two types of oxides—trioxides and pentoxides.
  4. Hydrides of nitrogen consist of H-bonding, which is absent in members of other elements.
  5. Nitrogen does not show penta-covalency because of the absence of d-orbitals, but all other elements show penta-covalency.
  6. Nitrogen dose not form complexes because of the absence of d-orbitals, while the other elements show complex formation (e.g. [PCl6]-, [AsCl6]-).
  7. The hydride of nitrogen (NH3) is highly basic in nature, whereas the hydrides of other elements are slightly basic.
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