How did the work of dmitri mendeleev differ from that of john newlands in the development of the periodic table

The work of Dmitiri Mendeleev surpassed beyond the work of John Newlands. The periodic table John Newlands proposed is organized into the relative atomic mass, which also has flaws, since the table is mixed up. While, Mendeleev's work grouped the elements according to their types/groups such as alkali metals and transistion metals, but it missed one important detail, which is the use of the atomic number.