If what is meant is by mean Atomic Mass , then they almost fall into "groups" or families of elements with similar chemical properties. HOWEVER there are exceptions where the sequence is "odd" notably
Putting potassium with the noble gases and argon in the alkali metals would be confusing.
This is why the Periodic Table is sequenced by ATOMIC NUMBER not by mean atomic mass.
Mendeleev arranged elements in his periodic table on the basis of increasing atomic masses.
By the increasing Atomic Mass.
properties of the elements and atomic masses
The elements are arranged in the increasing order of atomic masses and repeating properties by Mendeleev.
Mendeleev arranged the elements in a table in the increasing order of atomic masses and repeating periodic properties. In the modern long-form of periodic table, the elements are arranged in the increasing order of atomic number and repeating periodic properties.
Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.
He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.
Mendeleev arranged elements in his periodic table on the basis of increasing atomic masses.
In the first Periodic Table by Mendeleev, he arranged the elements in the increasing order of their atomic masses and repeating properties.
By the increasing Atomic Mass.
Elements are arranged in rows and columns. Elements are arranged in order of increasing atomic masses.
Mendeleev arranged the elements are arranged in order of increasing atomic masses. He founded that properties of elements are periodic when arranged in this pattern.
Elements are arranged in a periodic table by atomic number, lower on top and left. Atomic masses have no direct relationship to the arrangement of atoms, although generally atoms with higher atomic numbers will have higher atomic masses. (There are at least three exceptions for atoms with atomic numbers differing by 1.)
properties of the elements and atomic masses
in order of their reletive atomic masses
The elements are arranged in the increasing order of atomic masses and repeating properties by Mendeleev.
Dmitri Mendeleev was a scientist. He arranged elements in order of increasing atomic masses.