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- List of elements by symbol (14812 bytes)
39: <tr><td>Fr</td><td>[[francium]]</td><td>87</td><td></td></tr>
114: ...><td>[[tungsten]]</td><td>74</td><td>(German ''Wolfram'')</td></tr>
133: <tr><td>Di</td><td>[[didymium]]</td><td>-</td><td>Rare earth metal that proved ...
139: ...rancium]]</td><td>87</td><td>Current symbol is '''Fr'''.</td></tr>
140: <tr><td>Fr</td><td>[[florentium]]</td><td>61</td><td>Discred... - Gadolinium (9860 bytes)
175: ...)_oxide|gadolinia]], the [[oxide]] of Gadolinium, from Mosander's [[yttria]] in [[1886]]. The element ...
183: Gadolinium is never found in nature as the free element, but is contained in many minerals such... - Neodymium (12345 bytes)
111: * Neodymium is a component of [[didymium]] used for colouring glass to make [[welding|weld...
112: ... the green colour caused by [[iron]] contaminants from glass.
113: ...of neodymium ions can be used in [[laser]]s for infrared wavelengths (1054-1064 nm), e.g. Nd:YAG (yttr...
117: ...te plant growth. Rare earth element compounds are frequently used in China as [[fertilizer]].
120: ...orm until [[1925]]. The name neodymium is derived from the [[Greek language|Greek]] words ''neos'', ne... - Praseodymium (9138 bytes)
157: * Praseodymium is a component of [[didymium]] glass, which is used to make certain types of [...
160: The name Praseodymium comes from the [[Greece|Greek]] ''prasios'', meaning green...
162: ...ist]] baron [[C. F. Auer von Welsbach]] separated didymium into two elements, Praseodymium and [[Neodymium]]...
165: ...nazite]] and [[bastnasite]], and can be recovered from bastnasite or monazite by an [[ion exchange]] p...
200: ...otopes of praseodymium range in [[atomic weight]] from 120.955 [[atomic mass unit|u]] (121-Pr) to 158.... - Samarium (10157 bytes)
179: ...marium oxide is used in optical glass to absorb infrared light.
180: ...act as sensitizers for phosphors excited in the infrared.
184: ...hemist [[Paul Émile Lecoq de Boisbaudran]] from the mineral [[samarskite]] ((Y,Ce,U,Fe)<sub>3</...
190: Samarium is never found free in nature, but, like other rare earth elements,...
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