CBSE Questions for Class 9 Chemistry Structure Of The Atom Quiz 8 - MCQExams.com

Which of the following is one of the postulates of Rutherford's theory?
  • Electrons continuously lose energy
  • Electrons move in a spiral path around the nucleus
  • Electrons revolve in a specific path around the nucleus
  • Electrons revolve in a stationary orbit
For an element with atomic number 19, the 19th electron will occupy:
  • $$L$$-shell
  • $$M$$-shell
  • $$N$$-shell
  • $$K$$-shell
The particle used by Rutherford in $$\alpha$$-ray scattering experiment was__________.
  • neutron
  • electron
  • helium nuclei
  • X-rays
The size of the nucleus is approximately:
  • $$10^{-18}$$ m
  • $$10^{-10}$$ m
  • $$10^{-8}$$ m
  • none of these
The nucleus of the hydrogen atom is called as:
  • neutron
  • electron
  • proton
  • nucleons
Rutherford's scattering experiment is related to :
  • neutrons
  • atom
  • electron
  • nucleus
Which of the following was not proposed by Thomson?
  • The negative and positive charges are equal in magnitude
  • The electrons revolve around the nucleus in circular paths
  • The electrons are embedded in a positive sphere
  • Atoms are electrically neutral
Oxygen atom has an atomic mass of 16u and eight neutrons in its nucleus. What is its atomic number?
  • 4
  • 12
  • 8
  • 6
What do you think would be the observation if the $$\alpha$$-particle scattering experiment is carried out using a foil of a metal other than gold?
  • $$\displaystyle \alpha $$ particles would deflect by the foil by large angles
  • Most of the fast moving $$\displaystyle \alpha $$ particles would not pass straight through the metal foil
  • There would be no change in the observation
  • All particles would appear rebound
This diagram represents the atomic structure of which element?

433300_e8d5ec0bdf3d43c6b54ac566297472fd.png
  • Fluorine
  • Chlorine
  • Carbon
  • Oxygen
The following diagram represents the atomic structure of which element?
433301.PNG
  • Fluorine
  • Chlorine
  • Carbon
  • Oxygen
Which of the following statement is incorrect according to Thomson's model of an atom?
  • The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding.
  • The positive charge in the atom is spread all over like the red edible part of the watermelon.
  • The electrons are studded in the positively charged sphere, like the seeds in the watermelon.
  • The protons are studded in the positively charged sphere, like the seeds in the watermelon.
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
  • 4
  • 2
  • 8
  • 6
Which of the following are features of Rutherford nuclear model of an atom?
  • There is a positively charged center in an atom called the nucleus.
  • The electrons revolve around the nucleus in circular paths.
  • The size of the nucleus is very small as compared to the size of the atom.
  • All of the above
Thomson proposed that:
  • an atom consists of a positively charged sphere and electrons are embedded in it.
  • negative and positive charges are equal in magnitude. So that atoms as a whole are electrically neutral.
  • Both $$A$$ and $$B$$
  • None of above
Which of the following observations were obtained from $$\alpha$$-particle scattering experiment?
  • Most of the fast moving $$\alpha$$-particles passed straight through the gold foil
  • Some of the $$\alpha$$-particles were deflected by the foil by small angles
  • One out of every 12000 particles appeared to rebound
  • All of the above
Atoms react to achieve an octet in the outermost shell. This is achieved by:
  • sharing electrons
  • gaining electrons
  • losing electrons
  • all of the above
What is the distribution of electrons in nitrogen atom?
  • $$2, 4$$
  • $$2, 5$$
  • $$2, 6$$
  • $$2, 2$$
What is the distribution of electrons in an oxygen atom?
  • (2, 4)
  • (2, 8)
  • (2, 6)
  • (2, 10)
Which of the following atom has a valency of three?
  • Magnesium
  • Fluorine
  • Aluminium
  • Carbon
The following diagram represents the atomic structure of which element?
433302_4ec5e5ea43ea4ac48d857a2bf3d6930b.png
  • Fluorine
  • Neon
  • Argon
  • Sulphur
What is the distribution of electrons in a magnesium atom?
  • (2, 8, 1)
  • (2, 8, 2)
  • (2, 8, 3)
  • (2, 8, 4)
If the K and L shells of an atom are full, then what will be the total number of electrons in the atom?
  • 12
  • 8
  • 10
  • 16
What is the valency of fluorine atom?
  • 7
  • 1
  • 3
  • 6
Which of the following atom doesn't have its valency as one?
  • Lithium
  • Hydrogen
  • Magnesium
  • Sodium
What is the valency of sulphur atom?
  • 2
  • 3
  • 1
  • 4
In Rutherford's gold foil experiment, most of the alpha particles:
  • passed straight through the gold foil
  • were absorbed by the gold foil
  • were deflected by the gold foil
  • None of the above
"The atom as a whole is electrically neutral", is a statement proposed by which atomic model?
  • Thomson's atomic model
  • Goldstein's atomic model
  • Chadwick's atomic model
  • None of the above
What is the valency of chlorine atom?
  • 2
  • 3
  • 1
  • 4
Thomson's model was rejected because :
  • it was not clearly specified in detail
  • it could not explain how both positively and negatively charged particles protect their identity being together
  • it does not explain any repulsions which might result since all the positive charges are together in an cluster and same is the case with negative charges as well
  • All of these
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