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What element breaks down into yttrium-90?

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?