Periodic Table's Blank Spaces Filled In By Solving A Subatomic Shell Game. ScienceDaily . Retrieved June 4, 2025 from www.sciencedaily.com / releases / 2009 / 03 / 090323143912.htm ...

Then, gradually, as you move across the periodic table to heavier atoms in the lanthanide series, that 4f subshell finally fills up with its maximum number of 14 electrons. Why would this matter ...