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SCI & TECHLOW2h ago · Sep 23, 2026, 12:45 AM

Dmitri Mendeleev , Lars Fredrik Nilson solved element 21 mystery | The Advertiser - Cessnock

cessnockadvertiser.com.au · Australia · global

Dmitri Mendeleev and Lars Fredrik Nilson are credited with solving the mystery of element 21. This highlights a significant historical achievement in chemistry.

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