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2) Position of standing and germanium were left vacant by Mendeleev in his Periodic Table
3) Mendeleev used atomic mass of the elements as the unique criteria of the elements. He proposed that the chemical properties of elements are the periodic function of their atomic masses. And thus, he arranged the elements in the increasing order of their atomic masses
4) Nobel gases are inert elements. Their properties are different from the all other elements. Therefore, they are placed in a separate group
3) Mendeleev used atomic mass of the elements as the unique criteria of the elements. He proposed that the chemical properties of elements are the periodic function of their atomic masses. And thus, he arranged the elements in the increasing order of their atomic masses
4) Nobel gases are inert elements. Their properties are different from the all other elements. Therefore, they are placed in a separate group
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