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H2O2 is a compound, and the concept of "valence electrons" applies to atoms but not to compounds. If the question is or should be intended to be, "How many valence electrons did the atoms in one formula unit of H2O2 have before they reacted to form the compound?", the answer is one from each hydrogen atoms and six from each oxygen atom, for a total of 14.
Wiki User
∙ 12y ago
Wiki User
∙ 14y ago14
H = 1 valence electron
O = 6 valence electrons
H2 = 2
O2 = 12
=14
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