what's the difference between Newlands's classification system with Mendeleev's ''periodic table.''

Question

itz science related

Answer 1

J.A.R. Newlands - 1867 first version of Periodic Table . Newlands arranged the known elements by increasing atomic mass along horizontal rows seven elements long, stated that the 8th element would have similar properties to the first from the series. Newlands called this the law of octaves.
Newlands' work failed after Ca in predicting a consistent trend.
Dimitri Mendeleev 1869, Professor if Chemistry at the University of Saint Petersburg (Leningrad). Mendeleev stated that the elements vary periodically (in cycles) according to their atomic masses.

Mendeleev separated his elements and left spaces on his table in order for the periodicity to continue. He then predicted that elements would be discovered to fill these "gaps" in the table. Mendeleev even accurately stated the properties of these elements. Scandium (ekaboron), galluim (ekaaluminum), and germanium (ekasilicon). By 1886 all of the elements predicted by Mendeleev had been isolated.

When Mendeleev's notes show that the periodic system was created in a single day, February 17, 1869. He arrived at his system by puzzling over cards containing the names of the 63 known elements along with their atomic weights and important chemical and physical properties.

Answer 2

Newlands Periodic Table

Answer 3

Twillighter is wrong. Mendeleev actually arranged the elements in the periodic table in order of atomic number, not atomic mass.