Question

_______ was responsible for first grouping elements into triads based on similar properties.

Answer 1

German scientist Döbereiner was one responsible for grouping elements into triads based on most notably atomic mass, many of which can be found in the periodic table to be in a pattern (for example Iron Cobalt Nickel, elements 26, 27, 28)

Answer 2

I had the same answer A but I wanted to make sure