Тенесин

Тенесин
Ливерморий ← Тенесин → Оганесон
At
↑
Ts
↓
(Usu)
Периодична система
Общи данни
Име, символ, ZТенесин, Ts, 117
Група, период, блок17, 7, p
Химическа серияхалоген (вероятно)
Електронна конфигурация[Rn] 5f14 6d10 7s2 7p5 (вероятно)
e- на енергийно ниво2, 8, 18, 32, 32, 18, 7 (вероятно)
CAS номер54101-14-3
Свойства на атома
Атомна маса[294] u
Атомен радиус138  pm (вероятно)
Ковалентен радиус156 – 157 pm (вероятно)
Степен на окисление5, 3, 1, −1 (вероятно)
Йонизационна енергияI: 742,9 kJ/mol
II: 1785 – 1920,1 kJ/mol
(вероятни)
Физични свойства
Агрегатно състояниетвърдо вещество (вероятно)
Плътност7200±100 kg/m3 (вероятно)
Температура на топене723 K (450 °C) (±100 K, °C) (вероятно)
Температура на кипене883 K (610 °C) (вероятно)
История
Наименуванна щата Тенеси
ОткритиеОбединен институт за ядрени изследвания,
Национална лаборатория „Лорънс“ Ливърмор,
Университет „Вандербилт“ и
Национална лаборатория „Оук Ридж“ (2010 г.)
Най-дълготрайни изотопи
Изотоп ИР ПП ТР ПР
293Ts синт. 0,022 сек. [1] α 289Mc
294Ts синт. ≈0,07±0,02 сек. [2] α 290Mc
Тенесин в Общомедия

Тенесин (на латински: Tennessine, Ts), преди известен под временното название Унунсептий, е новооткритият химичен елемент с атомен номер 117. Той е от групата на халогенните елементи. Временното му обозначение е Uus. Дълги години това е единственият липсващ елемент от 7 период на периодичната система. От това, че структурата на електронната му обвивка наподобява халогенните елементи се съди, че има свойства близки до йода и астатия. Първият опит да се синтезира този елемент е направен в лабораторията за ядрени реакции „Фльоров“ към Обединения институт за ядрени изследвания в Дубна, Русия. Наименуван е на щата Тенеси.

Получаване

Получен е в Обединения институт за ядрени изследвания (ОИЯИ) в Дубна, Русия през 2009 – 2010 година. За синтеза на 117-ия елемент, мишена от берклий-249 (атомен номер 97), получен в Оукриджката национална лаборатория (САЩ), е обстрелвана с йони на калций-48 в ускорителя У-400 при Лабораторията за ядрени реакции ОИЯИ[3].

На 5 април 2010 година в списание „Physical Review Letters“[1] е приета за публикация научна статия, описваща откриването на новия химически елемент с атомен номер Z=117.

За синтеза на елемента се използват реакциите:

В резултат се е установило съществуването на шест ядра на новия елемент – пет на 293Ts и едно на 294Ts.

Има период на полуразпад 78 милисекунди[4].

Източници

  1. ↑ а б Oganessian, Yu. Ts. et al. Synthesis of a New Element with Atomic Number Z=117 // Physical Review Letters 104 (14). 2010. DOI:10.1103/PhysRevLett.104.142502. p. 142502. (на английски)
  2. ↑ Khuyagbaatar, J. et al. 48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr // Physical Review Letters 112 (17). 2014. DOI:10.1103/PhysRevLett.112.172501. p. 172501. (на английски)
  3. ↑ ((ru)) Российские и американские физики впервые синтезировали 117-ѝ элемент – РИА Новости
  4. ↑ ((ru)) Физики из Дубны синтезировали 117-й элемент

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