when solid copper (ii) oxide and hydrogen react, metallic copper and water is formed. Balance the equation

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.