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Atomic and Ionic Sizes of Lanthanides

" XeO3 is is...

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" $X e O_{3}$ is isostructural with $B r O_{3}^{-}$ ."
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Solution

" $X e O_{3}$ is isostructural with $B r O_{3}^{-}$ ."
Number of valence electrons in ${B r O}_{3}^{-} = 7 + (3 \times 6) + 1 = 26$
Number of valence electrons in noble gas compound $X e O_{3} = 8 + (6 \times 3) = 26$
The structure of $B r O_{3}^{-}$ is pyramidal and the structure of $X e O_{3}$ is also pyramidal.

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