Question

who was credited with developing the first periodic table and in what year did this occur?
dmitri mendeleev in 1869
dmitri mendeleev in 1896
robert mosley in 1906
rewatch

Explanation:

Dmitri Mendeleev creó la primera tabla periódica en 1869. Ordenó los elementos por masa atómica y propiedades químicas.

Answer:

Dmitri Mendeleev en 1869