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Why is BrF₄⁻ square planar, whereas BF₄⁻ is tetrahedral?

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter22: The Chemistry Of The Transistion Elements

Section22.2: Metallurgy

Problem 3Q

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Why is BrF₄⁻ square planar, whereas BF₄⁻ is tetrahedral?

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