Question

which scientist discovered that elements could be grouped into \triads\, or elements with similar properties?
james chadwich
aristotle
william ramsay
johann döbereiner
question 6
a scientist named john newlands discovere

Explanation:

Johann Döbereiner discovered the concept of triads. In the early 19th century, he noticed that certain groups of three elements (triads) had similar chemical properties and that the atomic weight of the middle - element in a triad was approximately the average of the atomic weights of the other two elements. For example, the triad of lithium (Li), sodium (Na), and potassium (K) has similar chemical behaviors.
James Chadwick is known for discovering the neutron. Aristotle was a philosopher with ideas about elements that were more in the realm of early, non - scientific (in the modern sense) classification. William Ramsay is known for his work on noble gases.

Answer:

Johann Döbereiner