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Periodic table is an arrangement of elements. Chlorine is an element and hence it is there on the periodic table.
periodic table is an arrangement of elements. Thiamin is not an element and hence not on the periodic table.
The periodic table of Mendeleev is a rational system of arrangement of chemical elements.
There are 118 elements in the current standard Periodic Table.
Dmitri Mendeleev's arrangement of elements is called the periodic table. He organized the elements based on their atomic mass and chemical properties, leading to the development of the modern periodic table used today.