explain the construction of long form of the periodic table
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Modern periodic law : The physical and chemical properties of elements are the periodic functions of their atomic number (or) electron configuration. i) The modern periodic table has eighteen vertical columns known as groups and seven horizontal rows known as periods. ... These are also called as Transition elements.
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1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. In 1886 French physicist Antoine Bequerel first discovered radioactivity.
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