Periodensystem mit 'Herkunftsangaben' der Entstehung der Elemente
https://media.ruhr.social/ruhr-social/media_attachments/files/112/354/627/715/388/674/original/2685989349520dc6.jpg
@isotopp @lobingera @mschfr Hach, ich liebe diesen nerdigen 🧵
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