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Elements were originally placed in order of atomic massnow they are placed in order of atomic number
According to the number of their protons
Mendeleev arranged the elements in the periodic table according to their atomic masses.
the elements in the modern periodic table are arranged according to their increasing atomic number.
The elements are listed in ascending order, according to their atomic number. The periodic table is arranged in such a way that elements in the same column tend to have similar properties.
The order of the periodic table is made according to the atomic weights of the elements. The number of protons and neutrons in the nucleus make the atomic weight. Protons make the elements in order of the periodic table.
Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.
the periodic table is arranged according to their atomic number.
The elements are arranged in order according to the atomic number. The periodic table is arranged so that the elements in each column have similar chemical properties.
Dmitri Mendeleev and Lothar Meyer first arranged the elements in the increasing order of atomic masses. Bohr and Henry Moseley then arranged the elements in the increasing order of atomic number.
Mendeleev arranged the elements by increasing atomic mass instead of like today by increasing atomic number.