| 21. | Molybdenum is a metallic element used to harden steel, and the American war buildup would require lots of it.
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| 22. | :I would say that for a mirror, " silver " and " gold " come from the metallic elements.
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| 23. | In 1875 the Parisian chemist Paul Emile Lecoq de Boisbaudran used a spectroscope to discover a new metallic element.
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| 24. | Superconductivity occurs in many metallic elements of the periodic system and also in alloys, intermetallic compounds, and doped semiconductors.
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| 25. | He likened the slick vehicle animations and metallic elements to " disaster movie score, and Country Bear Jamboree ".
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| 26. | Davy, by analogy with calcium, named " barium " after baryta, with the "-ium " ending signifying a metallic element.
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| 27. | Molybdenum is a hard, metallic element used in making steel, and lanthanide is a rare-earth element used in making glass.
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| 28. | Note that many of the common polyatomic anions are conjugate bases of acids derived from the oxides of non-metallic elements.
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| 29. | ""'Uridium " "'is a science fiction fictional metallic element, not to be confused with the real metallic element iridium ).
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| 30. | Rich in the metallic element antimony, improper usage of tartar-emetic causes a painful death with symptoms similar to arsenic poisoning.
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