![]() Source |
Source refers to the ore or synthetic method from which an element is currently produced. Note that the current source of an element may differ from the source in which the element was originally discovered. Not all elements are mined from specific ores: some are by-products of the refinement of other elements; others, such as technetium, are synthesized artificially by atom or neutron bombardment. Data were obtained from N. N. Greenwood and A. Earnshaw, CHEMISTRY OF THE ELEMENTS, New York, Pergamon, 1984. |