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Karnataka Board PUCPUC Science 2nd PUC Class 12

Group 18 Elements - The Noble gas Family

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Estimated time: 6 minutes
CBSE: Class 12

Key Points: Group 18 Elements - The Noble gas Family

Electronic Configurations:

  • General electronic configuration: ns² np⁶ (He = 1s²)
  • Elements: He, Ne, Ar, Kr, Xe, Rn
  • Noble gases have very high ionisation enthalpies and positive electron gain enthalpies — so they generally do not form compounds.
  • First noble gas compound prepared by Neil Bartlett: \[\mathrm{O}_{2}(\mathrm{g})+\mathrm{PtF}_{6}(\mathrm{g})\longrightarrow\mathrm{O}_{2}^{+}[\mathrm{PtF}_{6}]^{-}(\mathrm{s})\] — since the ionisation enthalpy of Xe ≈ that of O₂, Xe was reacted similarly.

Shapes and Hybridisation of Xenon Compounds:

Molecule Hybridisation Geometry Shape
XeO₃ sp³ Tetrahedral Pyramidal
XeO₄ sp³ Tetrahedral Tetrahedral
XeOF₂ sp³d Trigonal bipyramidal T-shaped
XeOF₄ sp³d² Octahedral Square pyramidal
XeO₂F₂ sp³d Trigonal bipyramidal Distorted trigonal bipyramidal (see-saw)
XeO₃F₂ sp³d Trigonal bipyramidal Trigonal bipyramidal
XeO₃F₄ sp³d² Octahedral Octahedral

Video Tutorials

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Shaalaa.com | P Block part 56 (Group 18 element)

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P Block part 56 (Group 18 element) [00:06:38]
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