Question: (a) Explain why BrF4- is square planar, whereas BF4- is tetrahedral. (b) How would you expect the H-X-H bond angle to vary in the series

(a) Explain why BrF4- is square planar, whereas BF4- is tetrahedral.
(b) How would you expect the H-X-H bond angle to vary in the series H2O, H2S, H2Se? Explain.

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