Question

One scientist took Döbereiner's work with triads and extended upon it using improved atomic weights that had been unavailable to Döbereiner. Who was this and what year did he do this?

Answer 1

Dmitri Mendeleev expanded Döbereiner's triad concept into the periodic table using improved atomic weights in 1869, which led to the formulation of the Periodic Law.

Step-by-step explanation:

The scientist who took Döbereiner's work with triads and extended upon it with improved atomic weights was Dmitri Mendeleev. Mendeleev, known for formulating the Periodic Law and creating a farsighted version of the periodic table of elements, made these significant contributions in the year 1869.

Utilizing the atomic weights and properties of elements, he arranged the elements into the periodic table based on their atomic mass, predicting the discovery of new elements and leaving gaps for them. This led to the confirmation of his periodic law when those elements were eventually discovered and fit into the table as he had predicted.