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Atomic Structure Important Question Paper In 9th Science Jul-30 , 2018

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Atomic Structure Important Question Paper In 9th Science

Atomic Structure - Important Question Paper

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    5 x 1 = 5

  1. Among the following the odd pair is

    (a)

    8O18,9F19

    (b)

    18Ar40,7N14

    (c)

    14Si30, 15P31

    (d)

    24Cr54, 19K39

  2. Change in the number of neutrons in an atom changes it to

    (a)

    an ion

    (b)

    an isotope

    (c)

    an isobar

    (d)

    another element

  3. The term nucleons refer to

    (a)

    Protons and electrons

    (b)

    only Neutrons

    (c)

    electrons and neutrons

    (d)

    Protons and neutrons

  4. The number of protons, neutrons and electrons present respectively in \(_{ 35 }^{ 80 }{ Br }\)

    (a)

    80, 80, 35

    (b)

    35, 55, 80

    (c)

    35, 35, 80

    (d)

    35, 45, 35

  5. The correct electronic configuration of potassium is

    (a)

    2,8,9

    (b)

    2,8,1

    (c)

    2,8,8,1

    (d)

    2,8,8,3

    6. Part B

    5 x 1 = 5

  6. Calcium and Argon are examples of a pair of __________

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    isobars     

  7. Total Number of electrons that can be accommodated in an orbit is given by_________.

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       2n2

  8. _________ isotope is used in the nuclear reactors.

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    Uranium-235

  9. The number of neutrons present in \(_{ 3 }^{ 7 }{ Li }\) is ------

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      4 

  10. The valency of Argon is ________

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       zero

    11. Part C

    6 x 2 = 12

  11. Name an element which has the same number of electrons in its first and second shell

  12. Write the electronic configuration of K and Cl

  13. Compare the charge and mass of protons and electrons.

  14. For an atom ‘X’, K, L and M shells are completely filled. How many electrons will be present in it?

  15. Ca2+ has completely filled outer shell. Justify your answer

  16. Arrange the following in the increasing order of atomic number
    Calcium, Silicon, Boron, Magnesium, Oxygen, Helium, Neon, Sulphur, Fluorine and Sodium

    17. Part D

    6 x 3 = 18

  17. An atom has 11 protons, 11 electrons and 12 neutrons. What is the atomic number and the name of the element?

  18. State the law of multiple proportions

  19. List the uses of isotopes?

  20. What is isotone? Give an example.

  21. Draw the structure of oxygen and sulphur atoms.

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