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Structure of th...

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  • Question 1
    1 / -0

    Which of the following has zero valency?

  • Question 2
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    Which of the following is always a whole number?

  • Question 3
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    Who proved that atoms had a nucleus? 

  • Question 4
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    $$_{18}  Ar^{40} , \  _{20} Ca^{40}$$ and $$_{19}  K^{40}$$ are:

  • Question 5
    1 / -0

    Rutherford’s $$\alpha-$$ particle scattering experiment led to the discovery of;

  • Question 6
    1 / -0

    Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

  • Question 7
    1 / -0

    The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:

  • Question 8
    1 / -0

    Which of the following statements about Rutherford’s model of atom are correct?

    (i) Proposed that nearly all the mass of an atom resides in the nucleus.
    (ii) Established that the $$\alpha$$–particles are four times as heavy as a hydrogen atom.
    (iii) Considered the nucleus as positively charged.
    (iv) Agreed with Thomson’s model.

  • Question 9
    1 / -0

    Which of the following in figure do not represent Bohr’s model of an atom correctly?

  • Question 10
    1 / -0

    The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

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