The Periodic Table is organized by Atomic Number (the number of protons) and the Electron Shell capacity (the number of electrons).
The Moseley system was based on spectral data and is rational.
elements
Atomic Number
before it there was no organization, but the first periodic table was organized by atomic mass.
The periodic table is based on an element's number of atoms. The elements are arranged from least to most number of atoms.
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I can find only two types The Mendeleves Periodic table based on Atomic weight of elements and The Modern Periodic table based on Atomic number of elements.
Modern periodic table is based on modern periodic law which states that physical and chemical properties of elemnts are periodic function of their atomic numbers.
All groups in the periodic table contain chemical elements.
Henry Moseley created current periodic table. Elements were arranged in order of atomic number.
atomic no
This is the law of chemical properties periodicity.