Demitri Mendeleev. He arranged it by Atomic Mass
CO3 is not placed in periodic table. Only elements are arranged in periodic table.
Mendeleev arranged his version of the Periodic Table in terms of ascending atomic weights and similar properties. Since it was first published in 1869, there have been updates and improvements.
Compared to Mendeleev's periodic table which was arranged my atomic mass, Moseley's was, however, arranged by atomic number.
He is important because he was the person who invented the Periodic Table and made it how it is today
He invented the periodic table. You must know what that means; he was the father of basic chemistry. Actually, he didn't discover the periodic table. He just arranged the only elements he had available in his day (not a lot) and arranged them based on patterns of # of protons, electrons, reactivity, etc. He didn't have an in-depth knowledge yet of electron configuration ;however, his "guess" turned out to have so many great implications that we now use his invention everyday everywhere.
The elements arranged according to their atomic number in the table are called periodic table.
In the periodic table, the elements are arranged by atomic number
by Atomic Mass
Periodic table was initially arranged by Mendeleev. It was rearranged by Moseley.
In 1869 Russian teacher and scientist Dmitri Mendeleev, presented a periodic table of the elements based on atomic weights. The current periodic table is arranged by the atomic numbers of the elements.
The Periodic Table was arranged by atomic number.
In the first Periodic Table by Mendeleev, he arranged the elements in the increasing order of their atomic masses and repeating properties.
before it there was no organization, but the first periodic table was organized by atomic mass.
The periodic table was first arranged by Dmitri Mendeleev in 1869. He organized the elements by increasing atomic mass and grouped them based on similar chemical properties. Gaps were left for undiscovered elements, with their properties predicted based on neighboring elements.
Dmitri Mendeleev first periodic table is called Mendeleev's periodic table. Elements are arranged according to atomic mass.
By Atomic Mass
The periodic table is arranged from left to right in the order of atomic numbers.