Question

dobereiner laid down periodic
rule​

Answer 1

Explanation:

A logical way to begin grouping elements together was by their chemical properties. In other words, putting elements in separate groups based on how they reacted with other elements. In 1829, a German chemist, Johann Dobereiner (1780–1849), placed various groups of three elements into groups called triads.

Answer 2

Answer:

A logical way to begin grouping elements together was by their chemical properties. In other words, putting elements in separate groups based on how they reacted with other elements. In 1829, a German chemist, Johann Dobereiner (1780–1849), placed various groups of three elements into groups called triads...