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What is the need for the classification of elements ?

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Knowledge Check

  • The Newlands' law of octaves for the classification of elements was found to be applicable only up to the element:

    A
    potassium
    B
    calcium
    C
    cobalt
    D
    phosphorus

  • Which of the following statement is correct in regard to the classification of elements?

    A
    Elements in modern periodic table are arranged on the basis of increasing atomic masses
    B
    Element in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers
    C
    In modern periodic table the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass
    D
    In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group

  • Correct statement for periodic classification of elements is:

    A
    All lanthanides and actinides belong to group IIIB
    B
    All inert gases end at p6 configuration
    C
    Iron, Cobalt and Nickel have same density so they are classed in VIIIB group together
    D
    There are 12 naturally occurring radioactive elements in the periodic table

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    The basis for the classification of elements in the modern periodic table is

    Why was the system of classification of elements into triads not found suitable ?

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    Which statement ( s) is are false for the periodic classification of element ?

    The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:

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