扩展元素周期表：修订间差异

我們仍不知道存在多少物理上可能的元素。[[光速]]限制了電子在更大[[電子層]]中運行，因此[[电中性]]原子的原子序最大可達到173（[[Ust]]）<ref name="Greiner">Walter Greiner and Stefan Schramm, ''Am. J. Phys.'' 76, 509 (2008), and references therein.</ref>；缺少部分或全部核外电子的原子核则有可能达到更重的水平，但这样的原子核根據核外[[電子排布]]分區將變得無意義；[[核殼層模型]]則限制離子狀態的元素最大至210號。<ref>{{Cite web | title = Extension of the periodic table | url = https://www.britannica.com/science/transuranium-element/Extension-of-the-periodic-table#ref81200 | publisher = britannica.com | access-date = 2018-09-06 | archive-url = https://web.archive.org/web/20180906195959/https://www.britannica.com/science/transuranium-element/Extension-of-the-periodic-table#ref81200 | archive-date = 2018-09-06 | dead-url = no }}</ref>（這類元素在上表以灰色底色及斜体顯示。）不過，有研究認為周期表有可能在更早的地方就結束了，或許就在[[穩定島]]之內，<ref>{{cite web|url=http://www.britannica.com/EBchecked/topic/603220/transuranium-element|title=transuranium element - Definition & Examples|publisher=|accessdate=2018-10-27|archive-url=https://web.archive.org/web/20101130112151/http://www.britannica.com/EBchecked/topic/603220/transuranium-element|archive-date=2010-11-30|dead-url=no}}</ref>代表元素的數目將為大約126個。<ref>S. Cwiok, P.-H. Heenen and W. Nazarewicz (2005). "Shape coexistence and triaxiality in the superheavy nuclei". ''Nature'' 433: 705.</ref>

 

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