he put them in groups to show acids from alkali's and gasses from metals
increasing Proton number.
The periodic table
The Russian chemist Dmitri Mendeleev was the first person to arrange all elements into families. He created the periodic table of elements and wrote a textbook between 1868 and 1870.
Mendeleev arranged the elements in a table with the rows ordered by atomic mass and the columns ordered the elements properties.
The Russian, Dmitri Mendeleev's periodic table became available to the scientific community vi publication in 1869 and he is generally credited with its "creation"
He arranged the elements in the increasing order of atomic mass and repeating properties so that it is easy to study the properties / reactivities of the elements.
Mendeleev arranged the elements according to their atomic weight and valence.
Atomic Mass.
Dmitri Mendeleev
Mendeleev arranged the elements in the periodic table according to their atomic masses.
your mums atomic acid
The periodic table of Mendeleev has 18 groups and 7 periods.
mendelev arranged the elements in the periodic table in the asending order of the mass number of elements.
Dmitri Mendeleev
Dmitri Mendeleev
increasing Proton number.
The periodic table