Question

Which scientist mainly contributes to classification of elements ?
(A) Dmitri Ivanovich Mendeleev
(B) A. E. B. Kankortois
(C) John Newland
(D) Wolfgang Dobereiner​

Answer 1

Answer:

Dmitri Ivanovich Mendeleev

hope it's help u

Answer 2

Answer:

B) A.E.B. Kankortois

Because he is the only scientist who mainly contributes to classification of elements.