William Ramsey suggest placing argon in separate group between chlorine and potassium (7h 22min, jan 1, 1898 y – 9h 12min, dec 31, 1898 y)
Description:
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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