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

Descrição:

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.

Adicionado na linha do tempo:

Data:

Imagens: