uunuuteen
Uunuuteen, also known as ununpentium, is a synthetic chemical element with the symbol Uup and atomic number 115. It is an extremely radioactive element that has no stable isotopes. Uunuuteen was first synthesized in 2003 by a team of Russian and American scientists at the Joint Institute for Nuclear Research in Dubna, Russia. The discovery was confirmed in 2004 by a team at the Lawrence Berkeley National Laboratory in California, USA.
The element is named after the temporary working name of the lab where it was discovered, the
Uunuuteen is a member of the pnictogen group, which includes elements like nitrogen, phosphorus, and arsenic.
The synthesis of uunuuteen involves the bombardment of americium-243 with calcium-48 ions. This reaction produces uunuuteen-288,