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Give the formula of the noble gas specie...

Give the formula of the noble gas species which is isostructural with `IBr_2^-`.

Text Solution

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In `IBr_(2)^(-)` Br is more electronegative than I so negative charge is on Br atom. Number of electron at central I atom = 7.
Charge provided by Br = 2 x 1 = 2.
Charge provided by I atom = I.
Total number of electrons around central I-atom = 7 + 2 + 1 = 10.
Electron pair around central atom = 10/2 = 5.
Bond pairs = 2. Lone pairs = 3.
According to V.S.E.P.R. theory it should be linear. Noble gas compound having I 0 electrons in valence shell is `Xe F_(2)`. It is also linear.
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