Which element has the atomic number 92?
The Transuranic elements are the elements with a higher atomic number than uranium, i.e. these metals are to the right of uranium in the periodic table.
All transuranic elements are radioactive with half-lives between a few 10,000,000 years (rare, e.g. Pu-244) over minutes to fractions of a second (often). Some isotopes of the lighter transuranic elements from Neptunium to Curium have half-lives of a few millions, millennia or centuries. They therefore make up part of the nuclear waste.
After uranium with atomic number 92, the series of transuranic elements begins with neptunium (element 93). In addition to the element plutonium (94), which is important for nuclear fission, americium (95), curium (96), berkelium (97), californium (98), einsteinium (99), fermium (100), mendelevium (101) and nobelium ( 102) as well as all other heavier elements to the transuranic elements.
The transuranic elements named here were produced and characterized in the working group led by Glenn Theodore Seaborg; Seaborg received the Nobel Prize in Chemistry for this in 1951.
Up to and including element 103, lawrencium, they belong together with thorium (90), protactinium (91) and uranium to the group of actinides.
Due to the geologically short half-lives, transuranic elements do not occur in nature, or only occur in traces that arise from neutron capture and subsequent beta decay of uranium. e.g.
The times given are half-lives.
The only exception is plutonium 244Pu, which dates back to the time the solar system was formed.
Transuranic elements can be produced technically from uranium or other elements with a high atomic number. For this purpose, such atomic nuclei are bombarded with neutrons or other atomic nuclei; the resulting core fusions result in transuranic elements.
Original meaning of the word
Transuran was originally a shorter term for: artificial super heavy element. The tiniest traces of plutonium Pu-244 from the time the solar system was formed was only discovered in 1971 long after the term “Transuran” was coined. In the original meaning one would therefore have to speak of transplutonium elements today.
Category: Nuclear Technology
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