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This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Hypothetical chemical element, symbol Uue and atomic number 119 Chemical element with atomic number 119 (Uue) Ununennium, 119 Uue Theoretical element Ununennium Pronunciation / ˌ uː n. uː n ˈ ɛ n i ə m / ⓘ (OON -oon- EN -ee-əm) Alternative names element 119, eka-francium ...
The collapse of the 5g orbital itself is delayed until around element 125 (unbipentium or eka-neptunium); the electron configurations of the 119-electron isoelectronic series are expected to be [Og]8s 1 for elements 119 through 122, [Og]6f 1 for elements 123 and 124, and [Og]5g 1 for element 125 onwards. [84]
Neither element 119 nor element 120 was observed. This implied a limiting cross-section of 65 fb for producing element 119 in these reactions, and 200 fb for element 120. [ 21 ] [ 10 ] The predicted actual cross section for producing element 119 in this reaction is around 40 fb, which is at the limits of current technology. [ 20 ] (
This experiment used a 249 Bk target and a 50 Ti beam to produce element 119, but since 249 Bk decays to 249 Cf with a half-life of about 327 days, both elements 119 and 120 could be searched for simultaneously: 249 97 Bk + 50 22 Ti → 299 119 Uue * → no atoms 249 98 Cf + 50 22 Ti → 299 120 Ubn * → no atoms. Neither element 119 nor ...
Python is a high-level, general-purpose programming language. Its design philosophy emphasizes code readability with the use of significant indentation. [33] Python is dynamically type-checked and garbage-collected. It supports multiple programming paradigms, including structured (particularly procedural), object-oriented and functional ...
When an element is discovered (synthesized), the element will be removed from this category. (when period 8 is not the same as "theoretical extension" anymore.)
In Python 2 (and most other programming languages), unless explicitly requested, x / y performed integer division, returning a float only if either input was a float. However, because Python is a dynamically-typed language, it was not always possible to tell which operation was being performed, which often led to subtle bugs, thus prompting the ...
In the unrestricted-input variant, the inputs can be arbitrary integers; in the restricted-input variant, the inputs must be in (T/4, T/2). The restricted version is as hard as the unrestricted version: given an instance S u of the unrestricted variant, construct a new instance of the restricted version S r ≔ {s + 2 T | s ∈ S u }.