File talk:Madelung rule.svg
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why is some of the chart grayed out but not other parts? --Dux Ducis Hodiernus (talk) 09:08, 2 May 2018 (UTC)
why is some of the chart grayed out but not other parts? --Dux Ducis Hodiernus (talk) 09:08, 2 May 2018 (UTC)[reply]