Which of the following species can be both Lewis acid and Lewis base? 
Definitions:
Dollar Price
The cost of a product or service expressed in terms of the amount of currency needed to purchase it.
Equilibrium Dollar Price
Refers to the price level at which the supply of dollars in the foreign exchange market is equal to the demand for dollars.
Flexible Exchange Rates
A foreign exchange system where the value of currencies is determined by market forces without direct government intervention.
Libras
A constellation in the zodiac, symbolized by the scales, or in a financial context, might be mistaken for "libra," which refers to a unit of weight or a former currency.
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