| 1. | Chemically pure elements could be mixtures of isotopes with differing atomic weights.
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| 2. | First only use isotopical pure substances best the pure elements.
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| 3. | Even materials considered pure elements often develop an oxide coating.
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| 4. | In 1867 Henry Enfield Roscoe obtained the pure element.
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| 5. | "It's primal, " he says, " reducing cooking down to working with pure elements ."
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| 6. | Several of the CPK colors refer mnemonically to colors of the pure elements or notable compound.
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| 7. | For pure elements, the oxidation state is zero.
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| 8. | However, both Arfwedson and Gmelin tried and failed to isolate the pure element from its salts.
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| 9. | In nature, sulfur can be found as the pure element and as sulfide and sulfate minerals.
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| 10. | When pure elements are sintered, the leftover powder is still pure, so it can be recycled.
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