Ununseptium



117 ununoctium
At
↑
Uus
↓
(Uhs)
General
Number ununseptium, Uus, 117
halogens
Block p
Appearance unknown,
probably dark metallic
Standard atomic weight predicted, (310)  g·mol−1
astatine)
shell 2, 8, 18, 32, 32, 18, 7
Phase presumably a solid
CAS registry number 87658-56-8
Selected isotopes
Main article: Isotopes of ununseptium
iso NA half-life DM DE (MeV) DP
References

Ununseptium (astatine.

History

The name ununseptium is used as a placeholder, as in scientific articles about the search for element 117. systematic element name for more information).

Ununseptium has not yet been discovered. Certain chemical properties, such as bond lengths, are predicted to differ from what one would expect based on periodic trends from the lighter semimetal properties as well.[citation needed] The plans for synthesis of Ununseptium in nearest future exists in Joint Institute for Nuclear Research in Dubna, Russia ([1])

References

  1. ^ Trond Saue. Principles and Applications of Relativistic Molecular Calculations., page 76
 
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