William Ramsey suggest placing argon in separate group between chlorine and potassium (7 ч 22 мин, 1 янв 1898 г. – 9 ч 12 мин, 31 дек 1898 г.)
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Chemically inert- did not fit with other elements on the table because had no leftover valence electrons.
Ramsey correctly predicted discovery of Neon, and it's properties.
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History of the Periodic Table
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