编辑“︁Uts”︁（章节）

=== 玻爾模型 ===
理查德·費曼指出，根據[[玻爾模型]]，原子序大於137的元素，其內層軌域可能電子無法穩定存在<ref>{{Cite web|title=how many more chemical elements are there for us to find?|url=http://www.bbc.com/earth/story/20160115-how-many-more-chemical-elements-are-there-for-us-to-find|accessdate=2017-07-18|author=Philip Ball|date=2016-01-15|work=[[英国广播公司|BBC]]|archive-date=2021-08-16|archive-url=https://web.archive.org/web/20210816211214/http://www.bbc.com/earth/story/20160115-how-many-more-chemical-elements-are-there-for-us-to-find}}</ref>，因爲在[[s軌域|1s原子軌域]]中的電子的速度''v''計算如下：

:<math>v = Z \alpha c \approx \frac{Z c}{137.036}</math>

當中''Z''是[[原子序]]，''α''是描述[[電磁力]]強度的[[精細結構常數]]。<ref>{{Cite journal|title=Quantum Physics of Atoms, Molecules, Solids, Nuclei and Particles|url=http://physicstoday.scitation.org/doi/10.1063/1.3069243|last=Eisberg|first=R.|last2=Resnick|first2=R.|date=1975-12|journal=Physics Today|issue=12|doi=10.1063/1.3069243|volume=28|pages=51–52|language=en|issn=0031-9228|last3=Sullivan|first3=Jeremiah D.|access-date=2021-04-25|archive-date=2017-12-21|archive-url=https://web.archive.org/web/20171221160609/http://physicstoday.scitation.org/doi/10.1063/1.3069243}}</ref>在這個計算中，任何原子序高於137的元素的1s軌域電子速度計算結果會比[[光速]]''c''還大<ref>{{cite web|title=When Will We Reach the End of the Periodic Table?|url=http://www.smithsonianmag.com/science-nature/when-will-we-reach-end-periodic-table-180957851/|accessdate=2017-07-18|work=smithsonian|archive-date=2022-03-24|archive-url=https://web.archive.org/web/20220324013638/https://www.smithsonianmag.com/science-nature/when-will-we-reach-end-periodic-table-180957851/}}</ref><ref>{{cite web|title=ununseptium ugly name beautiful element|url=http://www.slate.com/articles/health_and_science/elements/features/2010/blogging_the_periodic_table/ununseptium_ugly_name_beautiful_element.html|accessdate=2017-07-18|author=Sam Kean|date=2010-08-09|work=slate.com|quote=Einstein's theory of relativity says nothing can go faster than light. If you do the math, electrons could suddenly violate the laws of relativity around element 137, untriseptium|archive-date=2021-06-14|archive-url=https://web.archive.org/web/20210614131034/https://www.slate.com/articles/health_and_science/elements/features/2010/blogging_the_periodic_table/ununseptium_ugly_name_beautiful_element.html}}</ref>，因此任何不建基於[[相對論]]的理論（如波爾模型）不足以處理這種計算。

而若將其結果轉換成[[動量]]<ref name="okun">{{Cite journal|title=The Concept of Mass|url=http://physicstoday.scitation.org/doi/10.1063/1.881171|last=Okun|first=Lev B.|date=1989-06|journal={{link-en|今日物理 (雜誌)|Physics Today|Physics Today}}|issue=6|doi=10.1063/1.881171|volume=42|pages=31–36|language=en|bibcode=1989PhT....42f..31O|issn=0031-9228|access-date=2021-04-25|archive-date=2021-05-05|archive-url=https://web.archive.org/web/20210505153129/https://physicstoday.scitation.org/doi/10.1063/1.881171}}</ref>：
:<math>p  = \frac{mv}{\sqrt{1-v^2/c^2}}</math>
對於任意高的p，我們可以找到滿足該等式的v < c。且電子的速度與原子核存在與否無關，因此此計算矛盾並不意味著Uts會是元素週期表上的最後一個元素<ref name="rsc" />。