Subjective Type

What is the formal charge on the $$Br$$ and $$O$$ atoms in the $$BrO_{3}^{-}$$ ion?

Solution

Explanation:
The conventional Lewis structure of bromate ion is $$(O=)_2Br−O^−$$. Around the doubly bound oxygens there are 6 electrons (hence O is neutral); around bromine there are 7 electrons (4 from the doubly bound oxygens, 1 from the singly bound oxygen and 2 from the lone pair); and around the charged oxygen, there are (necessarily) 7 electrons (one from the Br−O bond and 6 lone pair electrons), so this centre (formally) has a negative charge.

Note that the number of electrons around the atom of interest determines the formal charge of that atom; single bonds share the electrons between the bound atoms, lone pairs devolve solely to the atom concerned.

Of course in the actual molecule, all of the oxygen atoms are equivalent.

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