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How could the modern periodic table remove various anomalies of Mendeleev’s periodic Table?
(i) The modern periodic table is based on , while Mendeleev’s periodic table was based on atomic mass.
(ii) The of an element have the same number of protons (or atomic number). So they are allowed the same position in the modern periodic table.
(iii) and are placed at 9th and 10th position, respectively.
(iv) has been allowed a unique position, i.e., it is placed at the top of alkali metals in the first group.
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