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#berzelius #element discovery #cerium #selenium #silicon #thorium #swedish chemist

⚛️🧪8️⃣5️⃣

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🟢🔬💡

#green spectral line #spectroscopy #element discovery #crookes #thallium spectrum

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🇩🇪🏞️🧪

#rhine river #german discovery #noddack tacke berg #element discovery #rhenus