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Structure of the Atoms Test - 31

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Structure of the Atoms Test - 31
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  • Question 1
    1 / -0
    Almost all of the mass of an atom is concentrated at the
    Solution
    Most of the mass of an atom is made up of protons and neutrons which are found in the nucleus. So, in essence, we can say that almost all of the mass of an atom is concentrated into a small space of the atom called the nucleus which is present at the centre of the atom. 
    So the correct answer is option A
  • Question 2
    1 / -0
    A neutron is:
    Solution

    Correct Answer: Option A

    Explanation: 

    A neutron is a subatomic particle that is present in the nucleus.

    A neutron is an electrically neutral subatomic particle having mass nearly equal to that of a proton.

  • Question 3
    1 / -0
    An atom is:
    Solution
    An atom is electrically neutral. It has both positive and negative charges that are equal in magnitude. So, overall, an atom is neutral.
  • Question 4
    1 / -0
    An atom is electrically .....
    Solution

  • Question 5
    1 / -0
    Deflection back of a few particles by large angle on hitting thin foil of gold in Rutherford's experiment showed that :
    Solution
    It was observed in Rutherford's experiment of gold foil that very few α\alpha particles were deflected back by large angles. The deflection of only a very few α\alpha particles helped him to conclude that the nucleus occupies very little space in an atom. He also concluded that the nucleus would be dense to deflect the α\alpha particles by large-angle. 
    Hence option C is correct. 
  • Question 6
    1 / -0
    Which of the following has the greatest mass?
    Solution
    Neutron has the greatest mass. Proton is a subatomic particle with the symbol pp and positive electric charge of +1+1 elementary charge and a mass slightly less than that of the neutron. 
    Mass of neutron is 1.6749×1027  kg1.6749\times10^{-27}  \ kg
    Mass of electron is 9.109×1031 kg9.109 \times 10^{-31} \ kg
    Mass of proton is 1.67262×1027 kg1.67262 \times 10^{-27} \ kg
    Mass of hydrogen cation is 1.6735×1027 kg1.6735 \times 10^{-27} \ kg
    Hence, the correct option is C.
  • Question 7
    1 / -0
    The radius of an atom is of the order of:
    Solution
    On the basis of scattering experiments, Rutherford proposed the model of an atom, which is known as the nuclear atomic model.
    According to this model -
    (i) An atom consists of a heavy positively charged nucleus where all the protons are present.
    (ii) The volume of the nucleus is very small and is only a minute fraction of the total volume of the atom.
    Nucleus has a radius of the order of 101310^{-13} cm and the atom has a radius of the order of 10810^{-8} cm.
  • Question 8
    1 / -0
    In Rutherford's α\alpha-particle scattering experiment,  a very small fraction of α\alpha - particles were deflected by 180180^{\circ}. What did he conclude from this observation?
    Solution
    We conclude from this observation that all the positive charge and mass of the atom were concentrated in a very small volume. Therefore, a very small fraction of α\alpha-particles are deflected by 180180^{\circ}.
  • Question 9
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    Isotone of an element has :
    Solution
    Isotone of an element has same no. of neutrons
  • Question 10
    1 / -0
    The space between a proton and electron in hydrogen atom is:
    Solution
    Hydrogen atom contains one proton in the nucleus and one electron outside the nucleus.
    The space between a proton and electron in hydrogen atom is empty.
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