9th Class Science Structure of the Atom Question Bank

done Structure of Atoms Total Questions - 70

• question_answer1)
  Radius of atom is of the order
  A)
   \[{{10}^{-10}}-{{10}^{-8}}cm\]                     done clear
  B)
   \[{{10}^{-12}}-{{10}^{-14}}cm\] done clear
  C)
   \[{{10}^{-14}}-{{10}^{-16}}cm\]   done clear
  D)
          \[{{10}^{-16}}-{{10}^{-20}}cm\] done clear
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• question_answer2)
  Mass of electron is
  A)
  \[\text{9}.\text{1}0\text{83 }\times \text{ 1}{{0}^{-\text{31}}}\text{ kg}\]   done clear
  B)
        \[\text{9}.\text{1}0\text{83 }\times \text{ 1}{{0}^{-\text{24}}}\,\text{kg}\] done clear
  C)
  \[\text{9}.\text{1}0\text{83 }\times \text{ 1}{{0}^{-\text{28}}}\text{ kg}\] done clear
  D)
          \[\text{1}.\text{67 }\times \text{ 1}{{0}^{-\text{24}}}\text{ gm}\] done clear
  View Solution play_arrow

• question_answer3)
  Rutherford's scattering experiment is related to
  A)
   neutrons             done clear
  B)
          atom done clear
  C)
   election              done clear
  D)
          nucleus   done clear
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• question_answer4)
  Size of the nucleus is of the order
  A)
   \[{{10}^{-12}}m\]              done clear
  B)
          \[\text{1}{{0}^{-\text{8}}}\text{m}\] done clear
  C)
  \[\text{1}{{0}^{-\text{15}}}\text{ m}\]                     done clear
  D)
   \[\text{1}{{0}^{\text{-10}}}\text{ m}\] done clear
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• question_answer5)
  The electron is
  A)
   \[\alpha -\text{ray}\] particle done clear
  B)
                          \[\beta -\text{ray}\] particle   done clear
  C)
   positron               done clear
  D)
          \[\gamma -\text{ray}\] done clear
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• question_answer6)
  The \[\frac{e}{m}\] ratio of an electron for all types of substances is
  A)
   constant              done clear
  B)
   less than one done clear
  C)
   greater than one done clear
  D)
          zero done clear
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• question_answer7)
  A proton is identical to
  A)
   the nucleus of helium done clear
  B)
   the nucleus of a hydrogen atom done clear
  C)
   a molecule of a hydrogen done clear
  D)
   an atom of hydrogen   done clear
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• question_answer8)
  Isotopes have the same
  A)
   Atomic number done clear
  B)
   Electronic configuration done clear
  C)
   Mass number-neutron done clear
  D)
   All of the above   done clear
  View Solution play_arrow

• question_answer9)
  Designation of an orbital with n = 6 and\[l=4\], is
  A)
   6s                    done clear
  B)
          \[6d\]   done clear
  C)
   \[6f\]                                    done clear
  D)
   \[6p\]   done clear
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• question_answer10)
  Principal quantum number determines,
  A)
   Atomic size   done clear
  B)
   Orbital angular momentum done clear
  C)
   Shape of the electronic cloud done clear
  D)
   Orientation of orbitals done clear
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• question_answer11)
  Electronic configuration \[\text{1}{{\text{s}}^{\text{2}}},\text{ 2}{{\text{s}}^{\text{2}}},\text{ 2}{{\text{p}}^{\text{3}}}\] represents the element
  A)
   \[O\]                                    done clear
  B)
   \[P\] done clear
  C)
   \[N\]                                      done clear
  D)
   \[Na\] done clear
  View Solution play_arrow

• question_answer12)
  Electron promotion rule is related to
  A)
  \[2s\to 2p\]                done clear
  B)
          \[2s\to 3s\] done clear
  C)
   \[2s\to 3p\]             done clear
  D)
   \[1s\to 2s\] done clear
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• question_answer13)
  The number of valency electrons for carbon are
  A)
   2                             done clear
  B)
          4   done clear
  C)
   6                                             done clear
  D)
   8 done clear
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• question_answer14)
  Atom and ion differ in
  A)
   the relative size               done clear
  B)
   the configuration done clear
  C)
   the presence of charge done clear
  D)
   all of these   done clear
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• question_answer15)
  Value of \[\frac{e}{m}\] of an electron was measured by
  A)
   Millikan                 done clear
  B)
   J.J. Thomson done clear
  C)
   Dalton                  done clear
  D)
   Rutherford done clear
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• question_answer16)
  The atomic number of an element is 11 and its mass number is 23. The perspective number of electrons, protons and neutrons in this atom will be
  A)
   11, 11, 12              done clear
  B)
         11, 12, 11 done clear
  C)
   12, 11, 11             done clear
  D)
         23, 11, 23 done clear
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• question_answer17)
  Number of electrons in the outer shell of the most stable or inert atoms is
  A)
   1                       done clear
  B)
          4 done clear
  C)
   6                       done clear
  D)
          8   done clear
  View Solution play_arrow

• question_answer18)
  Which of the following pairs are isotopes?
  A)
   Oxygen and ozone done clear
  B)
   Ice and steam done clear
  C)
   Nitric oxide and nitrogen dioxide done clear
  D)
   Hydrogen and deuterium   done clear
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• question_answer19)
  An atom which has a mass number of 14 and has 8 neutrons is an
  A)
   isotope of oxygen          done clear
  B)
   isobar of oxygen done clear
  C)
   isotope of carbon        done clear
  D)
   isobar of carbon done clear
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• question_answer20)
  The space between proton and electron in hydrogen atom is
  A)
   absolutely empty   done clear
  B)
   full of electromagnetic radiation done clear
  C)
   full of air done clear
  D)
   full of ether done clear
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• question_answer21)
  The number of orbitals present in Y shell are
  A)
   4                               done clear
  B)
          2 done clear
  C)
   1                             done clear
  D)
          3 done clear
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• question_answer22)
  Ne, \[\text{N}{{\text{a}}^{+}}\]and \[{{F}^{-}}\] have the same
  A)
   Mass number     done clear
  B)
      Number of nucleous done clear
  C)
   Number of electrons   done clear
  D)
   Number of protons done clear
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• question_answer23)
  Name of scientist associated with the discovery of neutron is
  A)
   J.J. Thomson                     done clear
  B)
   James Chadwick   done clear
  C)
   Rutherford                        done clear
  D)
   Yukawa done clear
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• question_answer24)
  Which of the following has an equal number of neutrons and protons?
  A)
   Hydrogen                           done clear
  B)
   Deuterium   done clear
  C)
   Fluorine             done clear
  D)
   Chlorine done clear
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• question_answer25)
  Members of which of the following have similar chemical properties?
  A)
   Isotope   done clear
  B)
   Isobars done clear
  C)
   Allotropes done clear
  D)
   Both isotopes and allotropes done clear
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• question_answer26)
  An atom of an element has 26 electrons and has a mass number 56. The nucleus of this atom contains .......... neutrons.
  A)
   26                          done clear
  B)
          36 done clear
  C)
   30                            done clear
  D)
          56 done clear
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• question_answer27)
  For an element with atomic number 19, the 19th electron will occupy
  A)
   L-shell               done clear
  B)
          M-shell   done clear
  C)
   N-shell               done clear
  D)
          K-shell done clear
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• question_answer28)
  Density of neutron is of the order of
  A)
  \[\text{1}{{0}^{\text{3}}}\text{ kg}/\text{cc}\]                   done clear
  B)
   \[\text{1}{{0}^{\text{6}}}\text{ kg}/\text{cc}\] done clear
  C)
  \[\text{1}{{0}^{\text{12}}}\text{ kg}/\text{cc}\]             done clear
  D)
          \[\text{1}{{0}^{\text{2}}}\text{ kg}/\text{cc}\] done clear
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• question_answer29)
  A completely filled and half filled orbit is spherically symmetrical. Point out which has spherical symmetry.
  A)
  \[\text{Na}\]                     done clear
  B)
          \[C\] done clear
  C)
   \[C{{l}^{-}}\]                     done clear
  D)
          \[S\] done clear
  View Solution play_arrow

• question_answer30)
  There is no difference between a 2p and 3p  orbitals regarding
  A)
   shape                 done clear
  B)
   size done clear
  C)
   energy              done clear
  D)
          value of n done clear
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• question_answer31)
  Following electronic configuration violates
  A)
   only Paulis rule   done clear
  B)
          only Hund's rule done clear
  C)
   only (n + 1) rule  done clear
  D)
          all of these   done clear
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• question_answer32)
  The presence of nucleus in an atom was established by
  A)
   John Dalton         done clear
  B)
          Rutherford   done clear
  C)
   J.J. Thomson        done clear
  D)
          J. Moore done clear
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• question_answer33)
  The number of electrons possessed by a cation are equal to
  A)
   The atomic number of the element done clear
  B)
   The atomic number + charge on the cation done clear
  C)
   The atomic number \[-\] charge on the cation   done clear
  D)
   Mass number \[-\] atomic number done clear
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• question_answer34)
  The atomic weight of an atom is due to
  A)
   Electrons and protons done clear
  B)
   Electrons and neutrons done clear
  C)
   Neutrons and protons done clear
  D)
   Electrons, neutrons and protons   done clear
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• question_answer35)
  The relative atomic masses of many elements are not whole numbers because
  A)
   they cannot be determined very accurately done clear
  B)
   the atoms ionize during the determinations done clear
  C)
   of the existence of isotopes   done clear
  D)
   of the presence of impurities done clear
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• question_answer36)
  Explanation of the presence of three unpaired electrons in nitrogen atom is given by
  A)
   Fault's principle  done clear
  B)
                              Hund's rule   done clear
  C)
   Aufbau principle done clear
  D)
   Uncertainty principle done clear
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• question_answer37)
  Though three fundamental particles are present in almost all elements. One element does not have
  A)
   neutron                done clear
  B)
          proton done clear
  C)
   electron                              done clear
  D)
   nucleons done clear
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• question_answer38)
  In a given atom no two electrons can have the same values for all the four quantum numbers This is called
  A)
   Hund's rule done clear
  B)
   Aufbau principle   done clear
  C)
   Uncertainty principle done clear
  D)
   Fault's exclusion principle done clear
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• question_answer39)
  Energy of an electron is specified by
  A)
   n                                            done clear
  B)
   1 done clear
  C)
   n and 1                done clear
  D)
          s done clear
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• question_answer40)
  Which of the following atoms has a valency equal to zero?
  A)
   Hydrogen            done clear
  B)
          Lithium done clear
  C)
   Neon                  done clear
  D)
          Oxygen done clear
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• question_answer41)
  Which of the following is the configuration of silver atom in ground energy state?
  A)
  \[\left[ \text{Kr} \right]\text{ 3}{{\text{d}}^{\text{1}0}}\text{ 4}{{\text{s}}^{\text{1}}}\]       done clear
  B)
      \[[Xe]4{{f}^{14}}5{{d}^{10}}6{{s}^{1}}\] done clear
  C)
  \[\left[ \text{Kr} \right]\text{ 4}{{\text{d}}^{\text{1}0}}\text{ 5}{{\text{s}}^{\text{1}}}\]         done clear
  D)
      \[\left[ \text{Kr} \right]\text{ 4}{{\text{d}}^{\text{9}}}\text{ 5}{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer42)
  A correct set of quantum numbers for the unpaired electron of chlorine atom is
  A)
  \[n-2\,\,\,\,\,\,\,\,\,\,\,l-1\,\,\,\,\,\,\,\,m-0\] done clear
  B)
  \[n-2\,\,\,\,\,\,\,\,\,\,\,l-1\,\,\,\,\,\,\,\,m-1\] done clear
  C)
  \[n-3\,\,\,\,\,\,\,\,\,\,\,l-1\,\,\,\,\,\,\,\,m-1\]   done clear
  D)
  \[n-3\,\,\,\,\,\,\,\,\,\,\,l-0\,\,\,\,\,\,\,\,m-0\] done clear
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• question_answer43)
  Which of the following is the correct configuration of chromium atom in ground energy state?
  A)
  \[~\left[ \text{Ar} \right]\text{ 3}{{\text{d}}^{\text{5}}}\text{ 4}{{\text{s}}^{\text{1}}}\]                 done clear
  B)
   \[~[Ar]\text{3}{{\text{d}}^{4}}\text{ 4}{{\text{s}}^{2}}\] done clear
  C)
  \[\left[ \text{Ar} \right]\text{ 3}{{\text{d}}^{\text{6}}}\text{ 4}{{\text{s}}^{\text{0}}}\]                 done clear
  D)
   \[\left[ \text{Kr} \right]\text{ 4}{{\text{d}}^{\text{5}}}\text{ 5}{{\text{s}}^{\text{1}}}\] done clear
  View Solution play_arrow

• question_answer44)
  According to uncertainty principle
  A)
   \[E=h\upsilon \]                done clear
  B)
          \[\lambda =\frac{h}{p}\] done clear
  C)
   \[\Delta x\times \Delta p=\frac{h}{4\pi }\]           done clear
  D)
   \[\Delta x\times \Delta p=\frac{h}{2\pi }\] done clear
  View Solution play_arrow

• question_answer45)
  2p orbitals have :
  A)
   n = 1,\[l\] = 2                     done clear
  B)
   n = 1,\[l\] = 0 done clear
  C)
   n =2,\[l\] = 1              done clear
  D)
          n = 2,\[l\] = 0 done clear
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• question_answer46)
  Size of nucleus is measured in
  A)
   amu                      done clear
  B)
   Angstrom done clear
  C)
   Fermi                     done clear
  D)
   cm done clear
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• question_answer47)
  Bohr's model explains
  A)
   the spectrum of hydrogen atom only done clear
  B)
   the spectrum of any atom or ion having on electron only   done clear
  C)
   the spectrum of hydrogen molecule done clear
  D)
   the solar spectrum done clear
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• question_answer48)
  Positron has nearly the same mass as that of
  A)
   proton                 done clear
  B)
   neutron done clear
  C)
   electron                                done clear
  D)
   a-particle done clear
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• question_answer49)
  Magnetic quantum number is related to
  A)
   size of orbitals done clear
  B)
   shape of orbitals done clear
  C)
   orientation of orbitals in the space   done clear
  D)
   All of these done clear
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• question_answer50)
  De-broglie relation describes the relationship of wavelength of an electron with
  A)
   mass                     done clear
  B)
   energy done clear
  C)
   momentum                         done clear
  D)
   charge done clear
  View Solution play_arrow

• question_answer51)
  Total number of unpaired electrons in d-orbitals of an atom of element of atomic number 29 is
  A)
   10                          done clear
  B)
   1 done clear
  C)
   Zero                        done clear
  D)
   5 done clear
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• question_answer52)
  Which of the following quantities is always in whole number?
  A)
   Atomic radius done clear
  B)
   Atomic number   done clear
  C)
   Mass number done clear
  D)
   Equivalent weight    done clear
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• question_answer53)
                           he cathode rays tube experiments carried out by J.J. Thomson demonstrated that
  A)
   at ratio of charge to-mass for the particles of the cathode rays varies as different gases are placed in the tube done clear
  B)
   the mass of an atom is essentially all contained in its very small nucleus done clear
  C)
   cathode rays are streams of negatively charged ions done clear
  D)
   the charge-to-mass ratio for a proton   done clear
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• question_answer54)
  For n = 3 energy level, the number of possible orbitals is
  A)
   1                             done clear
  B)
   3 done clear
  C)
   4                                             done clear
  D)
   9   done clear
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• question_answer55)
  Penetration power of proton is
  A)
   more than electron   done clear
  B)
   less than electron   done clear
  C)
   more than neutron        done clear
  D)
   None of these done clear
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• question_answer56)
  \[_{18}A{{r}^{40}}\] and \[_{19}{{K}^{40}}\] is called
  A)
   Isomers              done clear
  B)
   Isobars   done clear
  C)
   Isotopes              done clear
  D)
          Isotones done clear
  View Solution play_arrow

• question_answer57)
  Number of neutrons in heavy hydrogen atom is
  A)
  0                              done clear
  B)
          1   done clear
  C)
   2                             done clear
  D)
          3 done clear
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• question_answer58)
  For an atom of a given element, the number of electrons are equal to
  A)
   The number of protons + number of neutrons done clear
  B)
   The atomic number of the element   done clear
  C)
   The number of proton-number of neutrons done clear
  D)
   The-mass number of the element done clear
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• question_answer59)
  "The exact path of electron in 2p-orbital can not be determined", This statement is based upon
  A)
   Hund's rule          done clear
  B)
          Bohr's rule done clear
  C)
   Uncertainly principal   done clear
  D)
   Aufbau principal done clear
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• question_answer60)
  Maximum number of \[4f\] electrons that can have \[s=-\frac{1}{2}\] values, is
  A)
   14                                          done clear
  B)
   7   done clear
  C)
   5                             done clear
  D)
          10 done clear
  View Solution play_arrow

• question_answer61)
  The radius of the atom is of the order of
  A)
  \[\text{1}{{0}^{-\text{1}0}}\text{ cm}\]                 done clear
  B)
   \[\text{1}{{0}^{-\text{13}}}\text{ cm}\] done clear
  C)
  \[\text{1}{{0}^{-\text{15}}}\text{ cm}\]             done clear
  D)
          \[\text{1}{{0}^{-\text{8}}}\text{ cm}\]   done clear
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• question_answer62)
  Total energy of an electron in an atom is
  A)
   less than zero   done clear
  B)
   more than zero done clear
  C)
   may be less or more than zero done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer63)
  Remaining part of atom except outer orbit is called
  A)
   kernel                    done clear
  B)
   core done clear
  C)
   empty                  done clear
  D)
   none of these done clear
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• question_answer64)
  Maximum number of electrons in a subshell is given by
  A)
  \[(2l+1)\]                             done clear
  B)
  \[2(2l+1)\]   done clear
  C)
  \[{{(2l+1)}^{2}}\]             done clear
  D)
         \[2{{(2l+1)}^{2}}\] done clear
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• question_answer65)
  Two electrons occupying an orbital are distinguished by
  A)
   principal quantum number done clear
  B)
   angular momentum quantum number done clear
  C)
   magnetic quantum number done clear
  D)
   spin quantum number   done clear
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• question_answer66)
  The number of unpaired electrons in a chromic conclusion \[C{{r}^{+3}}\] (atomic number 24) is
  A)
   6                             done clear
  B)
   4 done clear
  C)
   3                               done clear
  D)
   1 done clear
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• question_answer67)
  Rutherford's scattering experiment led to the conclusion that?
  A)
   nucleus is very small in size done clear
  B)
   nucleus is very heavy and carries positive charge done clear
  C)
   most of the space in the atom is empty done clear
  D)
   all of these   done clear
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• question_answer68)
  The example of a pair of isobar is
  A)
  \[_{1}{{\text{H}}^{1}}\,\text{and}{{\,}_{1}}{{H}^{2}}\]                    done clear
  B)
   \[_{1}{{\text{H}}^{2}}\,\text{and}{{\,}_{1}}{{H}^{3}}\] done clear
  C)
  \[_{1}{{\text{H}}^{3}}\,\text{and}{{\,}_{2}}H{{e}^{3}}\]                   done clear
  D)
   \[_{1}\text{H}{{\text{e}}^{3}}\,\text{and}{{\,}_{1}}H{{e}^{4}}\] done clear
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• question_answer69)
  The number of electrons in 3d shell for element with Atomic number 26 is
  A)
   4                             done clear
  B)
   6   done clear
  C)
   8                       done clear
  D)
          10 done clear
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• question_answer70)
  Nuclei of isotopes differ in
  A)
   number of protons done clear
  B)
   number of neutrons   done clear
  C)
   number of neutrons and protons both done clear
  D)
   none of these done clear
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