Everything about Ununseptium totally explained
Ununseptium (or /ˌʌnənˈsɛptiəm/) is the temporary name of an undiscovered
chemical element in the
periodic table that has the temporary symbol Uus and has the
atomic number 117. It is expected to decay by
alpha decay to
element 115.
Future experiments
Ununseptium hasn't yet been discovered.
As of March 2008, no attempt to synthesise this element has been reported. The
Joint Institute for Nuclear Research in Dubna, Russia, has plans to attempt the synthesis of ununseptium in September 2008. The proposed reaction is:
»
Theoretical calculations in a quantum tunneling model with mass estimates from a macroscopic-microscopic model predict the alpha-decay half-lives of isotopes of the element 117 (namely,
289-303117) to be around 0.1-40 ms.
Electronic structure
Ununseptium would have 6 full
shells, 7
s+5
p+4
d+2
f=18 full
subshells, and 117
orbitals:
Bohr model: 2, 8, 18, 32, 32, 18, 7
Quantum mechanical model: 1s
22s
22p
63s
23p
64s
23d
10
4p
65s
24d
105p
66s
24f
145d
10
6p
67s
25f
146d
107p
5
Chemical properties
Certain chemical properties, such as bond lengths, are predicted to differ from what one would expect based on periodic trends from the lighter
halogens (because of relativistic effects). Ununseptium may show
semimetal properties as well.
Naming
The element with
Z=117 is historically known as
eka-astatine. The name ununseptium is a
systematic element name, used as a
placeholder until it's confirmed by other research groups and the
IUPAC decides on a name. According to IUPAC rules, names used for previous elements that have ultimately not been adopted are not allowed to be proposed for future use.
Further Information
Get more info on 'Ununseptium'.
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