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Give the formula of a noble gas species which is iso structural with IBr2

It should also have a negative sign above the formula and if it has then i 9 the answer


In IBr2  No. of valence electrons = 7+(2*7)+1 = 22
Noble gas compound having 22 electrons is XeF2 = 8 +(2*7) = 22
IBr2 is isostructural  with XeF2 and both are linear in shape .
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