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Mention any two demerits of the long for...

Mention any two demerits of the long form of the periodic table.

Text Solution

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I] The position of hydrogen is not clear though it is placed with alkali metals.
ii] Lanthanides and actinides are placed separately and can.t be included with other elements in the main portion of the periodic table.
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Knowledge Check

  • First, fourth and fifth periods of the long form the periodic table consist of elements respectively:

    A
    1. 2,8,8
    B
    2. 8,8,18
    C
    3. 2,18,18
    D
    4. 2,8,18
  • The number of periods in the long form of the periodic table is:

    A
    Seven
    B
    Nine
    C
    Eighteen
    D
    As many as groups.
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