C
Decomposition is of this form: A becomes B+C ... so after the reaction, the element A DECOMPOSES into two smaller elements, B and C.
Synthesis is the opposite: B+C becomes A AFTER THE REACTION.
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1 significant figure, because there is no decimal after the zero the zero doesn't count.
Answer:
Noble gases have a complete valence electron shell making them stable and nonreactive.
Explanation:
Its a form of anaesthesia used by dentists
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