One of the resonance structures of the oxalate ion (C2O42) is shown below. How many other resonance structures, that obey the octet rule, exist for the molecule? 
Definitions:
Compounded Monthly
A method of calculating interest where the interest earned is added to the principal each month, and the next month's interest is calculated on this new total.
Interest Rate
The proportion of a total amount of money that is levied for borrowing it, usually stated as an annual rate.
Annual Return
The percentage of gain or loss on an investment over a one-year period, taking into account both capital gains and dividends.
Retirement Fund
Financial resources that have been saved and are used to support a person's retirement.
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