atomic number 117. The second-heaviest known element and second-to-last
element of the 7th period of the periodic table, its discovery was
announced in Dubna, Russia, by a Russian–American collaboration in
2010, making it the most recently discovered element. One of its
daughter isotopes was created in 2011, partially confirming the results.
The experiment was repeated successfully by the same collaboration in
2012 and by a joint German–American team in 2014. When these
experiments have been examined and verified by the Joint Working Party,
the discoverers will be invited to give the element an official name.
Some of ununseptium's isotopes are expected to lie within the island of
stability, a predicted group of nuclides of enhanced stability with
atomic numbers around 120, but the isotopes of ununseptium created so
far have had predicted half-lives of less than one second. Like
fluorine, chlorine, and other halogens, ununseptium is expected to be a
group 17 element, but it is not currently expected to be a halogen, as
some of its properties are likely to be different due to relativistic
effects.
Read more: <https://en.wikipedia.org/wiki/Ununseptium>
_______________________________
Today's selected anniversaries:
1161:
Emperor Hailing of the Jin dynasty was assassinated in a
military camp near the Yangtze River front following Jin losses in the
Battle of Caishi.
<https://en.wikipedia.org/wiki/Prince_Hailing_of_Jin>
1467:
Troops under Stephen III of Moldavis defeated the forces of
Matthias Corvinus of Hungary in present-day Baia, Romania.
<https://en.wikipedia.org/wiki/Battle_of_Baia>
1943:
World War II: American and Australian forces began the Battle
of Arawe as a diversion before a larger landing at Cape Gloucester on
New Britain.
<https://en.wikipedia.org/wiki/Battle_of_Arawe>
1995:
The European Court of Justice handed down the Bosman ruling,
allowing footballers in the European Union to freely transfer from one
UEFA Federation to another at the end of their contracts.
<https://en.wikipedia.org/wiki/Bosman_ruling>
2005:
The F-22 Raptor, a stealth fighter aircraft that the United
States Air Force claimed is unmatched by any known or projected fighter,
entered into service despite a protracted and costly development period.
<https://en.wikipedia.org/wiki/Lockheed_Martin_F-22_Raptor>
_____________________________
Wiktionary's word of the day:
parsimonious:
1. Exhibiting parsimony; sparing in expenditure of money; frugal to excess;
penurious; niggardly; stingy.
2. (sports) Not conceding many goals.
3. Using a minimal number of assumptions, steps, or conjectures.
<https://en.wiktionary.org/wiki/parsimonious>
___________________________
Wikiquote quote of the day:
The meanings of poetry take their growth through the interaction
of the images and the music of the poem.
--Muriel Rukeyser
<https://en.wikiquote.org/wiki/Muriel_Rukeyser>
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