Identify the missing particle in the following nuclear reaction

In 2002, the rare earth elements mine in mountain pass, california was closed because

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together