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     EduGorilla 
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    Which of the following statements is true about Mendeleev's periodic table?

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    1. In Mendeleev's periodic table, cobalt (atomic mass = 58.9) appeared before nickel (atomic mass = 58.7).
    2. There was no place in Mendeleev's periodic table for the undiscovered elements of that time.
    3. In Mendeleev's periodic table, there is only one case where an element with a higher atomic mass appears before an element with a lower atomic mass.
    4. Mendeleev gave a specific position to the isotopes in his periodic table.
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