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Can someone help me with Chemistry?

1. For the chlorate ion ClO3- what are the oxidation numbers of Cl and O respectively? 2. Determine the correct oxidation numbers for ...

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An atom has 11 protons in the nucleus. what is the atomic number ? what is the name of this element?

... what is the electron configuration of this atom?

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What substances were likely to have been around when life first began?

What substances were likely to have been around when life first began? What conditions were these ...

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