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For any element before reaction, its oxidation number is 0. Molecules made from the atoms of the same element have 0 oxidation state in each atom. Examples are gaseous hydrogen and liquid bromine.

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9y ago
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14y ago

all the pure elements have zero oxidation state.....

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13y ago

Without being able to see part A, no one can answer your question.

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12y ago

Zero

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Q: What is the oxidation number of an elemental material?
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