Recall: Formal charge is given by:
F.C. = # of val. e– – (# of bonds + # of lone pair e–)
Based on the given Lewis structure, there are a total 32 valence electrons. We can use this information to determine the number of valence electrons of the unknown element.
For the polyatomic ion with a charge of –1: Not counting the electrons from the charge of the ion, the polyatomic ion has 32 – 1 = 31 valence electrons. Subtracting the valence electrons of the oxygens gives us:
For each of these ions determine the formal charge of the central atom, X. Arrange your answers in order increasing n.
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