A) Always +1
B) Always −2
C) Zero
D) The atomic mass
Answer: C
Explanation: Uncombined elements have an assigned oxidation number of zero. Examples include O₂ and solid copper.
A) Always +1
B) Always −2
C) Zero
D) The atomic mass
Answer: C
Explanation: Uncombined elements have an assigned oxidation number of zero. Examples include O₂ and solid copper.
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