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State modern periodic law of classificat...

State modern periodic law of classification of elements.

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It states "Properties of elements are periodic function of their atomic number."
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State the modern periodic law for classification of elements. How many (a) groups and (b) periods are there in the modern periodic table ?

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Knowledge Check

  • The statement that is not correct for periodic classification of elements is:

    A
    1. The properties of elements are periodic functions of their atomic numbers
    B
    2. Non-metallic elements are leser in number than metallic elements
    C
    3. The first ionisation energies of elements along a period do not vary in regular manner with increase in atomic number.
    D
    4. For transition elements, the d- subshells are filled with elements monotonically with increase in atomic number.

  • The statement that is not correct for periodic classification of elements is

    A
    The properties of elements are a periodic function of their atomic numbers.
    B
    Non-metallic elements are less in number than metallic elements.
    C
    The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number
    D
    For transition elements, the d-subshells are filled with electrons monotonically with increase in atomic number.

  • The statement that is not correct for the periodical classification of elements is

    A
    For transition elements the d-subshells are filled with electrons monatomically with increase in atomic number
    B
    The properties of elements are the periodic functions of their atomic numbers
    C
    The first ionisation energies of elements along a period vary in a regular manner with increase in atomic number
    D
    Non-metallic elements are lesser in number than metallic elements.

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    State the modern periodic law.

    State modern periodic law and assign IUPAC name of element with atomic number 111.

    (i) State the basis of classification of elements in the modern periodic table ? (ii) How does the metallic character of element vary as we go down the group.

    Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why?

    Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at "Periodic Law" ?

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