(a) On what basis did Mendeleev arrange the elements in his periodic table ? (B) On what basis are they arranged now ?
(a) On what basis did Mendeleev arrange the elements in his periodic table ?
(B) On what basis are they arranged now ?
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(a) Mendeleev arrange the element in his periodic table on the basis of atomic masses.
(b) Now they are arranged on the basis of atomic numbers.
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