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Period 7 element
This period contains the heaviest element which occurs naturally on earth, uranium. Subsequent elements in the period have been synthesized artificially. Whilst some of these (e.g. plutonium) are now available in tonne quantities, most are extremely rare, having only prepared in microgram amounts or less. Some of the later elements have only ever been identified in laboratories in quantities of a few atoms at a time.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Period_7_element". A list of authors is available in Wikipedia.|