| 21. | Q . Are there other chemical elements that we've left out?
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| 22. | Chemical substances can be chemical elements, chemical compounds, ions or alloys.
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| 23. | However, significant changes took place in the distribution of chemical elements.
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| 24. | Dysprosium has relatively few applications that cannot be made by other chemical elements.
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| 25. | Of the known chemical elements, 80 elements have at least one stable nuclide.
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| 26. | Dietary minerals are only the same as minerals on a chemical element level.
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| 27. | Seaborg developed the chemical elements americium and curium while in Chicago.
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| 28. | QUESTION : What's the chemical element with the highest atomic number?
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| 29. | In 2012, the laboratory had the synthetic chemical element livermorium named after it.
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| 30. | Sir Humphry Davy discovered seven chemical elements, and invented the miner's safety lamp.
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