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Figure 1
Ground-state HF+J Born maxima for atoms Li to Ar. Different spin electrons are colored in white and yellow. The inner (1s2) atomic cores, displayed as colored spheres following a standard CPK coloring scheme, contain two hidden opposite-spin electrons located at the nuclei. Second-period atoms are shown in the first and third rows, while third-period atoms occupy the second and fourth rows, so that same-group atoms are stacked columnwise and the periodicity described in the main text is clearly uncovered. In Si–Ar, the outer core hides the inner core at the scale of the plot.

IUCrJ
Volume 11| Part 2| March 2024| Pages 210-223
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524000915