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Element 111
Name: Sean
Status: student
Age: 10
Location: N/A
Country: N/A
Date: 1999
Question:
I'm doing a report on elements and I'd like to do one on
element #111 and if you could send me info about it, that would be great.
In the book we use, element #111 isn't listed, so that's why I want to do it.
Replies:
Hi Sean!
Element 111 was discovered recently (1994),
so that's why it is not listed in "old" books.
It was discovered at GSI, a German Laboratory, located
in Darmstadt, by S.Hofmann, V.Ninov, F.P. Hessberger
and others.
They gave it the name of Unununium, symbol: Uuu;
Atomic number: 111; Atomic weight: 272. It should be at
the same group as copper, silver, and gold ( group 11).
Density: 53.5 g/mL; solid at 298K.
It was prepared by shooting a nickel beam at a bismuth
target and at the first experiment only a few of the
atoms of 111 were detected, and they quickly decayed
after the original collision.
These kind of experiments that allows the
creation/discovery of new heavy elements are possible
by the use of a multi-stage accelerator facility
consisting of a whole system of linear and circular
accelerators and beam pipes which interconnect the accelerators.This
equipment exists at some big
laboratories in the world.
By the way, do you know that other heavy (called
super-heavy) elements were also created in labs? As
the number 114?
Thanks for asking NEWTON
Mabel
(Dr. Mabel Rodrigues)
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