Class 12 Chemistry P Block Elements Physical properties of group 18

Physical properties of group 18

  1. The electronic configuration for them are ns2np6
  • Helium 1s 22s2
  • Neon 1s2,2s2,2p6
  • Argon 1s2,2s2,2p6,3s2,3p6
  • krypton1s2,2s2,2p6,3s2,3p64s23d104p6
  • xenon 1s2,2s2,2p6,3s2,3p64s23d104p64d105s25p6
  • radon 1s2,2s2,2p6,3s2,3p64s23d104p64d105s25p64f145d106s26p6

2.Atomic size : : It increases down the group as every time a new shell is added as we move down. They actually have Vander wall radii.

  1. Ionization energy: They have highest ionization energy due to complete octet.
  2. 4. Electron gain Enthalpy: It is positive as they have complete octet so they have no attraction for incoming electron.
  3. Melting and boiling point: It is low due to weak force that exists that is Vander wall force.

Down the group size increases therefore Vander wall force also increases so as melting and boiling point increase.

  1. All noble gases are odorless and colorless and tasteless.
  2. All noble gases are sparingly soluble in water.
  3. All are inert gases as they have complete octet.
  4. All of them are monatomic.

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