Which of the following is not a merit of Mendeleevs periodic table? a)It helped in correcting the atomic masses of same of the element. b)he pridicted the property of some of the undiscovered elements and left gap for them. c) he framed the periodic table with vertical and horizontal columns and gave shape to it. d) he gave separate places to isotopes in his periodic table have.
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a)It helped in correcting the atomic masses of same of the element.
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the b part is the answer of this question
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