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