$(a)$ Why are anode rays called canal rays?
$(b)$ Mention two postulates of $J. J.$ Thomson's model.
$(c)$ Compare the properties of protons and electrons.
$(b)$ Mention two postulates of $J. J.$ Thomson's model.
$(c)$ Compare the properties of protons and electrons.
(N/A) The anode rays produced at the anode of the discharge tube are called canal rays because they pass through the holes (canals) of the cathode.
$(b)$ $(i)$ An atom consists of a positively charged sphere, and electrons are embedded in it.
$(ii)$ The negative and positive charges are equal in magnitude, making the atom electrically neutral.
$(c)$ Comparison of protons and electrons:
$(b)$ $(i)$ An atom consists of a positively charged sphere, and electrons are embedded in it.
$(ii)$ The negative and positive charges are equal in magnitude, making the atom electrically neutral.
$(c)$ Comparison of protons and electrons:
| $S.No.$ | Protons | Electrons |
| $(i)$ | Positively charged. | Negatively charged. |
| $(ii)$ | Mass is approximately $1 \, u$ (equal to $H$ atom). | Mass is negligible ($1/1840$ times that of a proton). |
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Atomic models have been improved over the years. Arrange the following atomic models in their chronological order:
$(i)$ Rutherford's atomic model
$(ii)$ Thomson's atomic model
$(iii)$ Bohr's atomic model
$(i)$ Rutherford's atomic model
$(ii)$ Thomson's atomic model
$(iii)$ Bohr's atomic model
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View SolutionIn the Thomson's model of atom,which of the following statements are correct?
$(i)$ The mass of the atom is assumed to be uniformly distributed over the atom.
$(ii)$ The positive charge is assumed to be uniformly distributed over the atom.
$(iii)$ The electrons are uniformly distributed in the positively charged sphere.
$(iv)$ The electrons attract each other to stabilize the atom.
$(i)$ The mass of the atom is assumed to be uniformly distributed over the atom.
$(ii)$ The positive charge is assumed to be uniformly distributed over the atom.
$(iii)$ The electrons are uniformly distributed in the positively charged sphere.
$(iv)$ The electrons attract each other to stabilize the atom.
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View SolutionOn the basis of Thomson's model of an atom,explain how the atom is neutral as a whole.
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View SolutionWhat 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?
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View SolutionWrite the conclusions drawn by Rutherford for the following observations during his $\alpha$-scattering experiment:
$(a)$ Most of the alpha particles passed straight through the gold foil.
$(b)$ Some alpha particles got deflected from their path.
$(c)$ $A$ very small fraction of alpha particles got deflected by $180^{\circ}$.
$(a)$ Most of the alpha particles passed straight through the gold foil.
$(b)$ Some alpha particles got deflected from their path.
$(c)$ $A$ very small fraction of alpha particles got deflected by $180^{\circ}$.
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