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All daughter isotopes (decay products) of element 117 were previously unknown; [73] therefore, their properties could not be used to confirm the claim of discovery. In 2011, when one of the decay products (289 115) was synthesized directly, its properties matched those measured in the claimed indirect synthesis from the decay of element 117. [74]
She is also a member of the Medical, Industrial and Research Isotopes Group, where she researches elements such as actinium, lanthanum, europium, and samarium. [9] [17] Phelps was involved in the discovery of the second-heaviest known element, tennessine (element 117).
So, element 105 was named dubnium, and element 106 was named seaborgium. The elements were placed in the periodic table’s seventh row, which is above the row of lanthanides and the row of actinides.
The three elements are promethium (element 61), moscovium (element 115) and tennessine (element 117), which is named after Tennessee. Moscovium is named after Moscow – that will be explained in ...
[10] [54] Tennessine, element 117 was the latest element claimed to be discovered, in 2009. [55] On 28 November 2016, scientists at the IUPAC officially recognized the names for the four newest elements, with atomic numbers 113, 115, 117, and 118.
Element 117 was named tennessine because of the participation of Oak Ridge National Laboratory, Vanderbilt University and the University of Tennessee.
Tennessine (117 Ts) is the most-recently synthesized synthetic element, and much of the data is hypothetical. As for any synthetic element, a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first (and so far only) isotopes to be synthesized were 293 Ts and 294 Ts in 2009.
The discoveries of the 118 chemical elements known to exist as of 2025 are presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element, as the exact date of discovery of most elements cannot be accurately determined.