| 1. | The pentavalent oxidation state of americium was first observed in 1951.
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| 2. | Polonium's oxidation states are + 2 and + 4.
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| 3. | The status of the + 1 oxidation state is still tentative.
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| 4. | Oxidation state can also have effect on spectroscopic studies of compounds.
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| 5. | They are oxoanions of chromium in the oxidation state + 6.
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| 6. | :* The chlorine gas reactant is in oxidation state 0.
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| 7. | This brown solid features platinum in the 4 + oxidation state.
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| 8. | Similarly manganese will change in colour depending on its oxidation state.
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| 9. | The oxidation state of copper in copper hydride is + 1.
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| 10. | Compounds in its preferred oxidation state of + 4 are covalent.
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