William Ramsey suggest placing argon in separate group between chlorine and potassium (7 h 22 m, 1 ene 1898 año – 9 h 12 m, 31 dic 1898 año)

Descripción:

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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