Atomic Structure Model Question Paper

7th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5
  1. The atomic number of an atom is ________

    (a)

    Number of neutrons

    (b)

    Number of protons

    (c)

    Total number of protons and neutrons

    (d)

    Number of atoms

  2. _________ Nucleons comprises of

    (a)

    Protons and electrons

    (b)

    Neutrons and electrons

    (c)

    Protons and neutrons

    (d)

    Neutrons and Positron

  3. Protons and neutrons are called __________

    (a)

    atom

    (b)

    nucleons

    (c)

    positive charge

    (d)

    negative charge

  4. Proton was discovered by _______________

    (a)

    Rutherford

    (b)

    Goldstein

    (c)

    Chadwick

    (d)

    J.J. Thomson

  5. Lithium atom contains 3 protons and 4 neutrons Its atomic number is __________

    (a)

    4

    (b)

    3

    (c)

    5

    (d)

    7

  6. 5 x 2 = 10
  7. What is the characteristics of proton?

  8. Why neutrons called neutral particles?

  9. What is an electron?

  10. What is isotone?

  11. In the notation of an atom ZXA. What does A & Z represent?

  12. 5 x 3 = 15
  13. An atom of an element has no electron, will that atom have any mass or not? Can atom exist without electron? If so then give example.

  14. Find what is common salt? Name the elements present in it? Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.

  15. Define isotopes? Give example.

  16. Write any two postulates of Thomson's model of atom.

  17. What makes atoms stick together?

  18. 2 x 5 = 10
  19. What are the conclusions/observations made by Rutherford?

  20. Explain the postulates of Dalton's atomic theory.

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