Question Pool Structure of Atom

Structure of Atom - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Chemistry Structure of Atom

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Qn 1.

Find the relation and match suitably.

A

B

C

Sir Humphrey Davy

Father of Electricity

Nucleus of an atom

Michael Faraday

Gold foil experiment

Law of Electrolysis

Rutherford

The presence of electric charges in substances

Sodium

  • Answer)

    A

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    Qn 2.

    Certain ideas of Dalton’s atomic theory are given below. Out of these find the wrong ones and rewrite them correctly.

    (a)Molecule is the smallest particle that can take part in chemical reactions.‍

    (b)Atoms of the same elements are not identical in properties,size and mass .

    (c)Matter is made up of minute particles called atoms.

    (d)Compounds are formed when atoms of two ore more elements combine in a simple ratio.



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    Qn 3.

    Many scientists proposed various theories regarding atom.They made use of different methods to arrive at these theories.

    For the theories given below ,find the method made use of.

    Rutherford : Experiments

    Dalton : ______________



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    Qn 4.

    a)Name the path along which electrons revolve around the nucleus. 

    b)What happens to the energy of electrons as the distance from the nucleus increases?



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    Qn 5.

    Match suitably

    J.J Thomson

    Positively charged particles

    Mass equal to that of a hydrogen atom

    Rutherford

    Particles with no charge

    Proton

    Chadwick

    Negatively charged particles

    Particles emitted from the cathode in a discharge tube

     

    • Answer)

      J.J Thomson

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      Qn 6.

      Match suitably

       

      A

      B

      Used as tracers for identifying the nutrient exchange in plants

      Uranium - 235

      Used in nuclear reactors as nuclear fuels

      Cobalt- 60

      For the diagnosis and treatment of ailments like cancer and tumour.

      Carbon‍- 14

      To determine the age of fossils

      Phosphorous- 31

       

      • Answer)

        A

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        Qn 7.

        Consider the isotope

        i)Complete the table

         

        Atomic number

         

        17

        Mass number

        35

        Electron

        ..a..

        Proton

        ...b...

        Neutron

        ...c....

        Electronic configuration

        ....d....

         

        ii) Draw the Bohr model of the given atom.



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        Qn 8.

        Given below are the three isotopes of Hydrogen

        a)How do these isotopes differ in the subatomic particles present in them?

        b)Which isotope of hydrogen is used in nuclear power plants?

         

         



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        Qn 9.

        Complete the table

         

        Element

        Atomic number

        No.of Protons

        No.of electrons

        No.of Neutrons‍

        147N

        7

        ....(a).....

        .....(b)......

        7

        18

        18

        ......(c).....

        .....(d).....

         



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        Qn 10.

        There are three shells in the atom of an element. Its outermost shell contains three electrons .Mass number of the element is 27

        a) How many electrons and neutrons are there ? 

        b) Draw the Bohr model of the atom. 



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        Qn 11.

        Atomic number and mass number of sodium are 11 and 23 respectively.

        a) How many neutrons are there in sodium atom?

        b) Find the total number of particles present in the nucleus of sodium atom ?

        c) In how many shells does the electron filling take place here ?



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        Qn 12.

        Complete the table suitably

         

         

        Sub atomic particles

        Charge

        Scientist who discovered the particle

        ....................

        ....................

        Chadwick

        ....................

        Positive

        .........................

        Electron

        ......................

        ........................

        • Answer)

          Sub atomic

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          Qn 13.

          According to the Electromagnetic Theory a charged body in circular motion continuously emits energy as radiations.

          What is the limitation of Rutherford’s atom model on the basis of this theory?



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          Qn 14.

          The maximum number of electrons that can be accommodated in the outermost shell of an atom(except the first shell) is ____________



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          Qn 15.
          • Name the scientist who suggested the planetary model of atom.

          • (J.J Thomson, Rutherford, Neils Bohr )



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          Qn 16.
          • Negatively charged particles in an atom are known as _____

          • (Electrons, protons , Neutrons)



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          Qn 17.

          Name the Scientist who discovered negatively charged particles in an atom.

          • J.J Thomson, Rutherford, Goldstein, Chadwick)



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          Qn 18.

          Name the part of an atom that contains protons and neutrons

          (Shell, Nucleus , Neutron ,Orbit)



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          Qn 19.

          The table given below contains the observations and inferences of Rutherford based on gold foil experiment.

           

           

          Observation

          Inference

          Most of the alpha particles passed through the gold foil without any deviation

          There is a small centre in an atom which consists of the entire mass and positve charge.

          A few alpha particles deviated in small angles.

          Most of the space in an atom is empty.

          Only a small number of alpha particles bounced back.

          There are positively charged parts in atoms.

           

          • Answer)

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            Qn 20.

            ശരിയായ ബന്ധംകണ്ടെത്തി ചേ‍ർത്തെഴുതുക.

            A

            B

            C

            James Chadwick

            Proton

            Negative charge

            J.J. Thomson

            Neutron

            Positive charge

            Rutherford

            Electron

            No charge

            • Answer)

              A

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              Qn 21.

              Given above is the pictorial representation of Gold foil experiment in which alpha particles are falling into the nucleus.

              Write down two inferences you arrive at about the structure of atom



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              Qn 22.

              The demerit of Rhutherforf model is shown in the figure. What is the limitation of this model according to this figure?



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              Qn 23.

              The Bohr model of Sulphur atom is given.

              Analyse the diagram and complete the following table.

               

              Atomic Number

               

              Proton

               

              Electron

               

              Neutron

               

              Mass number

               

              Electrons in the outermost shell