Basic information, atomic structure, and table of isotopes.
Atomic structure, chemical and physical properties, and table of nuclides.
Basic physical and historical information.
Physical data, chemical properties, health and environmental effects.
Full text of the monograph by J. F. Emery (Oak Ridge National Laboratory, Oak Ridge, Tennessee).
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Properties of the element, including its history, applications, and characteristics.
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