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QuestionChemistry

"The molecular geometry of the BrO^3 - ion is ________. A) trigonal pyramidal B) trigonal planar C) bent D) tetrahedral E) none of above"
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Step 1
: Determine the number of valence electrons for each atom in the BrO^3 - ion.

The bromine atom (Br) is in the 7th group of the periodic table, so it has 7 valence electrons. Oxygen atoms (O) are in the 6th group, so they have 6 valence electrons each. The ion has a charge of - 1, which means it has an extra electron that is not associated with any atom. This extra electron also contributes to the total number of valence electrons.

Step 2
: Draw the Lewis structure for the BrO^3 - ion.

First, distribute the valence electrons around the central bromine atom and the oxygen atoms. Place one pair of electrons between each bonded atom to form single covalent bonds. Then, add the remaining electrons as lone pairs on each atom to satisfy the octet rule. Since bromine has 7 valence electrons, it will have one lone pair, and each oxygen atom will have three lone pairs after forming bonds with bromine.

Final Answer

The molecular geometry of the BrO^3 - ion is trigonal pyramidal (A).

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