Unseptunium (Usu)

Unseptunium is the systematic name of the theoretical 171st element in the periodic table with a symbol of Usu and atomic number of 171. Unseptunium, also known as element 171, has one hundred seventy-one protons in its nucleus, and one hundred seventy-one electrons in its shells.
Atomic Number171
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6 8s2 5g18 6f14 7d10 8p6 9s2 6g1
Electron Shells2, 8, 18, 32, 50, 33, 18, 8, 2

Also Known As

  • Usu
  • element 171


  • Indonesianunseptunium
  • Japaneseウンセプトウニウム
  • Dutchunseptunium