Chemists have always looked for ways of arranging the elements to reflect the similarities between their properties. The modern periodic table lists the elements in order of increasing atomic number (the number of protons in the nucleus of an atom).he table below shows the example of Gallium, which Mendeleev called eka-aluminium, because it was the element after aluminium. Scandium and Germanium were the other two elements discovered by 1886, and helped to cement the reputation of Mendeleevâs periodic table.
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