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Which group of elements was not known at...

Which group of elements was not known at the time when Mendeleev created his periodic table ?

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Knowledge Check

  • The number of elements known at that time when Mendeleev arranged them in the periodic table was

    A
    63
    B
    60
    C
    71
    D
    65

  • The number of elements known at that time when Mendeleev arranged them in the periodic table was:

    A
    63
    B
    60
    C
    71
    D
    65

  • Which of the following elements were not known when Mendeleev published his periodic table?

    A
    Lanthanodis
    B
    Actinoids
    C
    Noble gases
    D
    Noble metals