How can we measure the radius for noble gases?

For noble gases, the radius is measured as van der Waals radius because these atoms are held together by weak van der Waals forces.

The Electron Configurations for Noble Gases

  1. Helium 1s2
  2. Neon [He] 2s2 2p6
  3. Argon [Ne] 3s2 3p6
  4. Krypton [Ar] 3d10 4s2 4p6
  5. Xenon [Kr] 4d10 5s2 5p6
  6. Radon [Xe] 4f14 5d10 6s2 6p6
  • In the case of inert or noble gases, the shells are completely filled with electrons, and they are stable.
  • As a result of this, due to the completely filled electronic configuration, the electronic repulsion in the noble gases are high.
  • So the electrons tend to be away from each other to minimise this repulsion, leading to an increased atomic size of the noble gases.
  • The atomic radius of the noble gases is determined by van der Waals radius, which is comparatively larger than ionic or covalent radii.

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