Give the formula and describe the structure of a noble gas species which is isostructural with:
(i) ${I C l_{4}}^{-}$ (ii) ${I B r_{2}}^{-}$ (iii) ${B r O_{3}}^{-}$

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Solution

(i) $X e F_{4}$ is isostructural with $I C l_{4}^{-}$ . It is square planar due to $s p^{3} d^{2}$ hybridization which results in octahedral geometry with two lone pairs occupy opposite positions.
(ii) $X e F_{2}$ is isostructural with $I B r_{2}^{-}$ . It has a linear shape due to $s p^{3} d$ hybridization which results in trigonal bipyramidal geometry with 3 lone pairs in equatorial plane.
(iii) $X e O_{3}$ is isostructural with $B r O_{3}^{-}$ . It has a pyramidal shape due to $s p^{3}$ hybridisation with terahedral geometry in which one position is occupied by a lone pair.

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