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Johann proposed "Law of Triads"- triads (3) of elements- middle element- average of outside ones (19h 40min, jan 2, 1829 y – 21h 30min, jan 1, 1830 y)

Description:

Halogen Triad- Chlorine, Bromine, Iodine
Alkali Metal Triad- Lithium, Sodium, Potassium

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History of the Periodic Table

BySonya Callendar
26 Dec 2017
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684

Date:

19h 40min, jan 2, 1829 y
21h 30min, jan 1, 1830 y
~ 12 months

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