Template:Infobox element/symbol-to-period: Revision history

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    14 October 2021

    • curprev 20:2620:26, 14 October 2021‎ imported>MainEditor‎ 1,057 bytes +1,057‎ Created page with "{{Infobox element/symbol-to-period/format |symbol={{{symbol|}}} |format={{{format|none}}} |value={{#switch:{{{symbol|}}} <!--- Period 1 ---> | H | He = 1 <!--- Period 2 --->..."
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