Problem: How many equivalent resonance structures are possible for the perbromate ion (BrO4– )?A. 1      B. 2      C. 3      D. 4      E. 5

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Determine the number of possible resonance structures for (BrO4-). We will have to draw the Lewis Structure of BrO4first.

Step 1: Determine the central atom in this molecule.
Step 2: Calculate the total number of valence electrons present.     
Step 3: Draw the Lewis Structure for the molecule.
Step 4
: Determine the formal charges of Br, the single bonded O and the double bonded Os.

Step 1: Determine the central atom in this molecule.

Br is less electronegative than O, therefore, Br is the central atom

Step 2: Calculate the total number of valence electrons present.          

BrO4-:

          Group              Valence Electrons

Br        7A                    7 valence e x 1
  O         6A                    6 valence e x 4
                                   = 31 valence e

-1 charge                     +1 e­-

 Total = 32 valence e-

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Problem Details

How many equivalent resonance structures are possible for the perbromate ion (BrO4– )?

A. 1      B. 2      C. 3      D. 4      E. 5

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