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You have one ransom note and a few clues. Someone has taken hydrogen, and as it is the most abundant chemical element in the universe, it must be rescued quickly!
Your knowledge of the periodic table of the elements and polyatomic ions will be useful in this endeavor.
Your abilities at balancing chemical equations will surely be tested as you attempt to bring back hydrogen from its hiatus. You will need to place the coefficients carefully.
The Hydrogen Hiatus header photo is by User:Jurii (http://images-of-elements.com/) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons.
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