P-Block Elements and Their Compounds-II: Interhalogen Compounds (For CBSE, ICSE, IAS, NET, NRA 2022)

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Interhalogen Compounds

  • The halogens form a series of mixed binary compounds called the interhalogens.
  • These compounds are of the type , , , and .

Preparation

  • The interhalogen compounds can be prepared by direct reaction between the halogens.
  • They can also be prepared by the action of a halogen on a lower interhalogen compound.

Noble Gases

  • The gaseous elements helium, neon, argon, krypton, xenon and radon constitute the 18 group.
  • All of them, except helium, have the closed shell, , configurations Helium has the configuration.

Occurrence

All the noble gases, except radon, are present in atmosphere.

Relative Abundance of Group 18 Element in Dry Air

Relative Abundance of Group 18 Element
  • Radon is produced in the radioactive decay of radium.
  • Helium is present up to l0 per cent in natural gas.

Properties

Properties of Group 18 Element

Properties of Group 18 Element

Compounds of Noble Gases

  • The first compound of noble gases was made by Neil Bartlett in 1962 by the reaction of xenon with .
  • , and do not form any compounds whereas Kr does form .
  • Radon is a radioactive element and all its isotopes have very short half-lives.

Xenon Compound

  • Xenon reacts with fluorine to form binary fluorides, , and .
  • The product formed depends on the temperature and xenon-fluorine ratio.

(2: 1 ratio)

(1: 5 ratio)

(1: 20 ratio)

, and are all white solids.

dissolves in water and undergoes slow hydrolysis in water.

and react with water violently to give xenon trioxide and hydrogen fluoride.

on partial hydrolysis gives, xenon oxofluorides

Xenon fluorides react with strong Lewis acids to form complexes.

may also act as a fluoride accepter from fluoride ion donors to form fluorinate anions.

can be prepared by hydrolysis of .

can be prepared by the reaction of barium perxenate with conc. Sulphuric acid.

Structure of Xenon Compounds

The structures and shapes of the common xenon fluorides and oxides are shown below.

Structure of Xenon Compounds

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