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Wednesday, 22 February 2017

The P-Block Elements - VI


GROUP 18 ELEMENTS:

Ionisation enthalpy:
  • They have very high ionization enthalpy because of completely filled orbitals.
  • Ionisation enthalpy decreases down the group because of increase in size.
Atomic radii:
  • Increases down the group because the number of shells increases down the group.
Electron gain enthalpy: They have large electron gain enthalpy because of stable electronic configuration.

Melting and boiling point:
  • It has low melting and boiling point due to the presence of only weak dispersion forces.
Shapes:
  • XeF2 is linear, XeFis square planar and XeF6 is distorted octahedral. KrF2 is known but no true compound of He Ne and Ar are known.
Compounds of Xe and F:
  • XeF2, XeFand XeF6 are powerful fluorinating agents.
Compounds of Xe and O:
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