Quantum redactiones paginae "Chalcogenia (elementa)" differant
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[[File:Chalkogene.jpg|thumb|Quattor chalcogenia]]
Chalcogenia sunt [[elementum chemicum|elementa chemica]] cum sex [[electron]]ibus in [[sphaera electronica]] externa, igitur sunt eorum [[reactio chemica|reactiones chemicae]] similis.
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