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"Periodic Table's Blank Spaces Filled In By Solving A Subatomic Shell Game." ScienceDaily. ScienceDaily, 26 March 2009. <www.sciencedaily.com / releases / 2009 / 03 / 090323143912.htm>.
Students do not typically think beyond the seventh row of the periodic table or the possibility of electrons filling the 6f and 5g subshells.