$(a)$ 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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Similar Questions
Give reasons for the following:
$(a)$ In potassium and calcium,the filling of electrons in the $N$-shell starts after the $M$-shell has acquired $8$ electrons,although the $M$-shell can accommodate up to $18$ electrons. Why?
$(b)$ There is a difference between mass number and atomic mass.
$(a)$ In potassium and calcium,the filling of electrons in the $N$-shell starts after the $M$-shell has acquired $8$ electrons,although the $M$-shell can accommodate up to $18$ electrons. Why?
$(b)$ There is a difference between mass number and atomic mass.
Medium
View Solution$(i)$ Write the postulates of the Bohr model of an atom.
$(ii)$ Draw a sketch of the Bohr model of an atom with atomic number $15$.
$(ii)$ Draw a sketch of the Bohr model of an atom with atomic number $15$.
Easy
View SolutionShow diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Medium
View SolutionGive reasons for the following:
$(a)$ Isotopes of an element are chemically similar.
$(b)$ An atom is electrically neutral.
$(c)$ Noble gases show least reactivity.
$(d)$ Nucleus of an atom is heavy and positively charged.
$(e)$ Ions are more stable than atoms.
$(a)$ Isotopes of an element are chemically similar.
$(b)$ An atom is electrically neutral.
$(c)$ Noble gases show least reactivity.
$(d)$ Nucleus of an atom is heavy and positively charged.
$(e)$ Ions are more stable than atoms.
Medium
View SolutionGive reasons:
$(a)$ Mass number of an atom excludes the mass of an electron.
$(b)$ The nucleus of an atom is charged.
$(c)$ The alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.
$(a)$ Mass number of an atom excludes the mass of an electron.
$(b)$ The nucleus of an atom is charged.
$(c)$ The alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.
Medium
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