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July 31, 2021
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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.

Added to timeline:

26 Dec 2017
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264
History of the Periodic Table

Date:

7h 22min, jan 1, 1898 y
9h 12min, dec 31, 1898 y
~ 12 months

Images:

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