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