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The basis of Mendeleev’s periodic table.
Every chemical element has its atom, atom is a tiny particle. The chemical element has atomic number and atomic mass. Atomic mass can also be termed as molar mass. The atomic number of a chemical element can be given by the number of protons, the atomic mass can be given by the sum of the number of protons and number of neutrons.
The atomic mass is exactly double the atomic number for most of the chemical elements, but for some chemical elements it may be higher. For example, sodium is the element with atomic number 11
, but its atomic mass is 23
amu, which is higher than the double of that atomic number.
The Mendeleev periodic table is based on the periodic law, that elements are arranged in the order of increasing their atomic weights. He was not fully successful in constructing the periodic table.