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Karnataka Board PUCPUC Science 2nd PUC Class 12

Group 15 Elements - The Nitrogen Family

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Estimated time: 8 minutes
CBSE: Class 12

Key Points: Group 15 Elements - The Nitrogen Family

General electronic configuration: ns² np³

Element Symbol Configuration
Nitrogen N [He] 2s² 2p³
Phosphorus P [Ne] 3s² 3p³
Arsenic As [Ar] 3d¹⁰ 4s² 4p³
Antimony Sb [Kr] 4d¹⁰ 5s² 5p³
Bismuth Bi [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³
  • General Trends: Down the group → atomic size, density, boiling point increase, while ionisation enthalpy decreases.
  • Melting Point Trend: Increases from N → As, then decreases from As → Bi.
  • Electron Gain Enthalpy: Generally increases down the group (becomes more negative).
  • Oxidation States: Show −3, +3, +5 → +5 stability decreases down the group due to the inert pair effect.

Important Compounds/Exceptions:

  • PCl₅ exists as ionic solid → [PCl4]+[PCl6]
  • NF₃ is stable, while other trihalides are unstable
  • Bond strength: PCl₃ > AsCl₃ > SbCl₃

Special Reactions:

  • PH₃ is not spontaneously inflammable (unlike impure phosphine)
  • With AgNO₃: forms Ag₃P (black ppt)
  • With NH₃: forms (NH₄)₂PtCl₆ (yellow ppt)

Phosphorus Allotropes:

  • White P: Reactive, glows in the dark (chemiluminescence), soluble in CS₂
  • Red P: Stable, no glow
  • Black P: Most stable, highest density, polymeric
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