Periodic Table of Elements




Ununpentium was discovered in February 2004 by Russian scientists at the Gesellschaft fr Schwerionenforschung (GSI) in Darmstadt, Germany and American scientists at the Lawrence Livermore National Laboratory.

Name: Ununpentium
Symbol: Uup
Atomic number: 115
Atomic weight: 288.19
State: presumably a solid
Group, period, block: 15, 7, p
Color: unknown
Classification: unknown presumably post-transition metals
Electron configuration: 5f14 6d10 7s2 7p3

Physical properties

Density: 11 g/cm-3
Melting point: ~700 K,~430 C,~810 (predicted) F
Boiling point: ~1400 K,~1100 C,~2000 (predicted) F

Atomic properties

Oxidation states: 1, 3
Electronegativity: no data
Ionization energies: 1st: 538.4 kJmol-1
Covalent radius: 162 pm
Van der Waals radius: no data
  • Uup
  • Electron Configuration


Ununpentium is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 288Uup in 2004. There are five known radioisotopes from 287Uup to 291Uup.