Question

How did Mendeleev arrange the elements in the first periodic table?

A. In order of increasing melting points and densities.

B. In order of increasing atomic mass.

C. In order of decreasing atomic mass.

D. In order of increasing atomic number.

Answer 1

B. In order of increasing atomic Mass :)

Answer 2

Answer:

D.in order of increasing atomic number

Explanation:

is D because in the way u see the periodic table numbers that is based on is in the way they may have an effect to certain chemicals