Question

which scientist established the law of octaves?
antoine lavoisier
dmitri mendeleev
henry moseley
john newlands

Explanation:

The Law of Octaves was proposed by John Newlands, who noticed that when elements were ordered by atomic mass, properties repeated every 8 elements. Lavoisier focused on element classification, Mendeleev created the periodic table, and Moseley refined it using atomic number.

Answer:

D. John Newlands