cupric sulfate pentahydrate

or

copper(II) sulfate pentahydrate

C₆H₆

 _{Although you are not required to memorize this formula, it was added because benzene is a very important compound in Organic Chemistry.  Two ways of representing this molecule are shown below.}

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Ba(Na)₂

Of course, this is only a joke.  BaNaNa is a fruit, not a chemical compound!