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Periodic classification of elements

9th Science - Periodic classification of elements Book Back Questions

Periodic classification of elements Book Back Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5

  1. If Dobereiner is related with 'law of triads', then Newlands is related with __________.

    (a)

    Modern periodic law

    (b)

    Hund's rule

    (c)

    Law of octaves

    (d)

    Pauli's Exclusion principle

  2. Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their__________

    (a)

    atomic numbers

    (b)

    atomic masses

    (c)

    similarities

    (d)

    anomalies

  3. Elements in the modern periodic table are arranged in__________ groups and __________ periods.

    (a)

    7,18

    (b)

    18,7

    (c)

    17,8

    (d)

    8, 17

  4. The increasing order of the energy of subshells is

    (a)

    s>p>d>f

    (b)

    s

    (c)

    p

    (d)

    p

  5. If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p1, then it will occupy___________ block of the periodic table.

    (a)

    s

    (b)

    p

    (c)

    d

    (d)

    f

    6. 5 x 1 = 5

  6. In Dobereiner's triads, the atomic weight of the middle element is the _______of the atomic masses of 1st and 3rd elements.

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    average

  7. Noble gases belong to________ group of the periodic table

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    18th

  8. The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was____________

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    atomic mass

  9. B, Si, Ge and As are the examples of___________

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    metalloids

  10. Example for liquid metal is___________

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    mercury

    11. 2 x 1 = 2

  11. Newland's periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.

    (a) True
    (b) False

  12. Metals can gain electrons

    (a) True
    (b) False
    13. 5 x 1 = 5

  13. Triads

    14. (1)

    Henry Moseley

  14. Alkali metal

    15. (2)

    Newlands

  15. Law of octaves

    16. (3)

    Dobereiner

  16. Alkaline earth metal

    17. (4)

    Calcium

  17. Modern Periodic Law

    18. (5)

    Sodium
    1 x 2 = 2

  18. State modern periodic law.

    19. 2 x 3 = 6

  19. What are groups and periods in the modern periodic table?

  20. What are the limitations of Mendeleev's periodic table?

    21. 1 x 5 = 5

  21. State any five features of modern periodic table.

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