| 1. | Only a minority of elements are found uncombined as relatively pure minerals.
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| 2. | It never appears uncombined in nature and almost never stays uncombined for long.
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| 3. | It never appears uncombined in nature and almost never stays uncombined for long.
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| 4. | It is extremely difficult to isolate from any compounds, let alone keep uncombined.
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| 5. | As a result, platinum is often found chemically uncombined as a native metal.
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| 6. | A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth only in chemical compounds.
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| 7. | Gold itself is usually found uncombined, but when found as a chemical compound, it is most often combined with tellurium.
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| 8. | A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth almost exclusively in chemical compounds.
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| 9. | Aqueous solutions of potassium bisulfate behave as two separate, uncombined compounds, K 2 SO 4 and H 2 SO 4.
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| 10. | Tungsten is a hard, rare metal under standard conditions when uncombined, but is found naturally on Earth only in chemical compounds.
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