Editing Periodic table (section)

===Electron configuration table===
The following table shows the electron configuration of a neutral gas-phase atom of each element. Different configurations can be favoured in different chemical environments.<ref name="Jorgensen" /> The main-group elements have entirely regular electron configurations; the transition and inner transition elements show twenty irregularities due to the aforementioned competition between subshells close in energy level. For the last ten elements (109–118), experimental data is lacking<ref>{{cite journal |url=https://www.nist.gov/pml/periodic-table-elements |title=Periodic Table of the Elements |author=[[National Institute of Standards and Technology]] (NIST) |date=August 2019 |journal=NIST |access-date=7 February 2021 |archive-date=8 February 2021 |archive-url=https://web.archive.org/web/20210208182536/https://www.nist.gov/pml/periodic-table-elements |url-status=live }}</ref> and therefore calculated configurations have been shown instead.<ref>{{cite journal |last1=Fricke |first1=B. |editor-last=Dunitz |editor-first=J. D. |year=1975 |journal=Structure and Bonding |volume=21 |pages=89–144 |title=Superheavy elements a prediction of their chemical and physical properties|publisher=Springer-Verlag |location=Berlin |doi=10.1007/BFb0116496|isbn=978-3-540-07109-9 }}</ref> Completely filled subshells have been greyed out.

{{Periodic table (electron configuration)}}