JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank

done Atomic number, Mass number Atomic species Total Questions - 74

• question_answer1)
  The number of electrons in an atom of an element is equal to its                                              [BHU 1979]
  A)
                  Atomic weight   done clear
  B)
                  Atomic number done clear
  C)
                  Equivalent weight            done clear
  D)
                  Electron affinity done clear
  View Solution play_arrow

• question_answer2)
  The nucleus of the element having atomic number 25 and atomic weight 55 will contain [CPMT 1986; MP PMT 1987]
  A)
                  25 protons and 30 neutrons done clear
  B)
                  25 neutrons and 30 protons done clear
  C)
                  55 protons done clear
  D)
                  55 neutrons done clear
  View Solution play_arrow

• question_answer3)
  If W is atomic weight and N is the atomic number of an element, then                                   [CPMT 1971, 80, 89]
  A)
                  Number of \[{{e}^{-1}}=W-N\] done clear
  B)
                  Number of \[_{0}{{n}^{1}}=W-N\] done clear
  C)
                  Number of \[_{1}{{H}^{1}}=W-N\] done clear
  D)
                  Number of \[_{0}{{n}^{1}}=N\] done clear
  View Solution play_arrow

• question_answer4)
  The total number of neutrons in dipositive zinc ions with mass number 70 is        [IIT 1979; Bihar MEE 1997]
  A)
                  34           done clear
  B)
                  40 done clear
  C)
                  36           done clear
  D)
                  38 done clear
  View Solution play_arrow

• question_answer5)
  Which of the following are isoelectronic with one another            [NCERT 1983; EAMCET 1989]
  A)
                  \[N{{a}^{+}}\] and \[Ne\]             done clear
  B)
                  \[{{K}^{+}}\] and \[O\] done clear
  C)
                  \[Ne\] and \[O\]              done clear
  D)
                  \[N{{a}^{+}}\] and \[{{K}^{+}}\] done clear
  View Solution play_arrow

• question_answer6)
  The number of electrons in one molecule of \[C{{O}_{2}}\]are [IIT 1979; MP PMT 1994; RPMT 1999]
  A)
                  22           done clear
  B)
                  44 done clear
  C)
                  66           done clear
  D)
                  88 done clear
  View Solution play_arrow

• question_answer7)
  Chlorine atom differs from chloride ion in the number of [NCERT 1972; MP PMT 1995]
  A)
                  Proton  done clear
  B)
                  Neutron done clear
  C)
                  Electrons             done clear
  D)
                  Protons and electrons done clear
  View Solution play_arrow

• question_answer8)
  \[CO\] has same electrons as or the ion that is isoelectronic with \[CO\] is                                            [CPMT 1984; IIT 1982; EAMCET 1990; CBSE PMT 1997]
  A)
                  \[N_{2}^{+}\]    done clear
  B)
                  \[C{{N}^{-}}\] done clear
  C)
                  \[O_{2}^{+}\]    done clear
  D)
                  \[O_{2}^{-}\] done clear
  View Solution play_arrow

• question_answer9)
  The mass of an atom is constituted mainly by [DPMT 1984, 91; AFMC 1990]
  A)
                  Neutron and neutrino   done clear
  B)
                  Neutron and electron done clear
  C)
                  Neutron and proton       done clear
  D)
                  Proton and electron done clear
  View Solution play_arrow

• question_answer10)
  The atomic number of an element represents [CPMT 1983; CBSE PMT 1990; NCERT 1973; AMU 1984]
  A)
                  Number of neutrons in the nucleus done clear
  B)
                  Number of protons in the nucleus done clear
  C)
                  Atomic weight of element done clear
  D)
                  Valency of element done clear
  View Solution play_arrow

• question_answer11)
  An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be [CPMT 1980]
  A)
                  26           done clear
  B)
                  30 done clear
  C)
                  36           done clear
  D)
                  56 done clear
  View Solution play_arrow

• question_answer12)
  The most probable radius (in pm) for finding the electron in \[H{{e}^{+}}\] is       [AIIMS 2005]
  A)
                  0.0          done clear
  B)
                  52.9 done clear
  C)
                  26.5        done clear
  D)
                  105.8 done clear
  View Solution play_arrow

• question_answer13)
  The number of unpaired electrons in the \[F{{e}^{2+}}\] ion is   [MP PET 1989; KCET 2000]
  A)
                  0              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer14)
  A sodium cation has different number of electrons from
  A)
                  \[{{O}^{2-}}\]     done clear
  B)
                  \[{{F}^{-}}\] done clear
  C)
                  \[L{{i}^{+}}\]      done clear
  D)
                  \[A{{l}^{+3}}\] done clear
  View Solution play_arrow

• question_answer15)
  An atom which has lost one electron would be [CPMT 1986]
  A)
                  Negatively charged done clear
  B)
                  Positively charged done clear
  C)
                  Electrically neutral done clear
  D)
                  Carry double positive charge done clear
  View Solution play_arrow

• question_answer16)
  Number of electrons in the outermost orbit of the element of atomic number 15 is         [CPMT 1988, 93]
  A)
                  1              done clear
  B)
                  3 done clear
  C)
                  5              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer17)
  The atomic weight of an element is double its atomic number. If there are four electrons in \[2p\] orbital, the element is                                                [AMU 1983]
  A)
                  \[C\]      done clear
  B)
                  \[N\] done clear
  C)
                  \[O\]     done clear
  D)
                  \[Ca\] done clear
  View Solution play_arrow

• question_answer18)
  An atom has the electronic configuration of \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\], \[3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{5}}\]. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be [MP PMT 1987]
  A)
                  35 and 45             done clear
  B)
                  45 and 35 done clear
  C)
                  40 and 40             done clear
  D)
                  30 and 50 done clear
  View Solution play_arrow

• question_answer19)
  Which of the following particles has more electrons than neutrons
  A)
                  \[C\]      done clear
  B)
                  \[{{F}^{-}}\] done clear
  C)
                  \[{{O}^{-2}}\]     done clear
  D)
                  \[A{{l}^{+3}}\] done clear
  View Solution play_arrow

• question_answer20)
  Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6                                 [NCERT 1971]
  A)
                  Contains more neutrons               done clear
  B)
                  Contains more electrons done clear
  C)
                  Contains more protons done clear
  D)
                  Is a different element done clear
  View Solution play_arrow

• question_answer21)
  In the nucleus of  \[_{20}C{{a}^{40}}\] there are [CPMT 1990; EAMCET 1991]
  A)
                  40 protons and 20 electrons done clear
  B)
                  20 protons and 40 electrons done clear
  C)
                  20 protons and 20 neutrons done clear
  D)
                  20 protons and 40 neutrons done clear
  View Solution play_arrow

• question_answer22)
  \[N{{a}^{+}}\]ion is isoelectronic with     [CPMT 1990]
  A)
                  \[L{{i}^{+}}\]      done clear
  B)
                  \[M{{g}^{+2}}\] done clear
  C)
                  \[C{{a}^{+2}}\]  done clear
  D)
                  \[B{{a}^{+2}}\] done clear
  View Solution play_arrow

• question_answer23)
  \[Ca\] has atomic no. 20 and atomic weight 40. Which of the following statements is not correct about \[Ca\]atom                                                                 [MP PET 1993]
  A)
                  The number of electrons is same as the number of neutrons done clear
  B)
                  The number of nucleons is double of the number of electrons done clear
  C)
                  The number of protons is half of the number of neutrons done clear
  D)
                  The number of nucleons is double of the atomic number done clear
  View Solution play_arrow

• question_answer24)
  Pick out the isoelectronic structures from the following                                 \[\underset{\text{I}}{\mathop{CH_{3}^{+}}}\,\]     \[\underset{\text{II}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,\]     \[\underset{\text{III}}{\mathop{N{{H}_{3}}}}\,\]     \[\underset{\text{IV}}{\mathop{CH_{3}^{-}}}\,\]      [IIT 1993]
  A)
                  I and II  done clear
  B)
                  I and IV done clear
  C)
                  I and III done clear
  D)
                  II, III and IV done clear
  View Solution play_arrow

• question_answer25)
   Number of electrons in \[-CON{{H}_{2}}\] is       [AMU 1988]
  A)
                  22           done clear
  B)
                  24 done clear
  C)
                  20           done clear
  D)
                  28 done clear
  View Solution play_arrow

• question_answer26)
  The atomic number of an element having the valency shell electronic configuration \[4{{s}^{2}}4{{p}^{6}}\] is     [MP PMT 1991]
  A)
                  35           done clear
  B)
                  36 done clear
  C)
                  37           done clear
  D)
                  38 done clear
  View Solution play_arrow

• question_answer27)
  The present atomic weight scale is based on [EAMCET 1988; MP PMT 2002]
  A)
                  \[{{C}^{12}}\]     done clear
  B)
                  \[{{O}^{16}}\] done clear
  C)
                  \[{{H}^{1}}\]       done clear
  D)
                  \[{{C}^{13}}\] done clear
  View Solution play_arrow

• question_answer28)
  Isoelectronic species are              [EAMCET 1989]
  A)
                  \[{{K}^{+}},\,C{{l}^{-}}\]                done clear
  B)
                  \[N{{a}^{+}},\,C{{l}^{-}}\] done clear
  C)
                  \[Na,\,Ar\]          done clear
  D)
                  \[N{{a}^{+}},\,Ar\] done clear
  View Solution play_arrow

• question_answer29)
  If the atomic weight of an element is 23 times that of the lightest element and it has 11 protons, then it contains [EAMCET 1986; AFMC 1989]
  A)
                  11 protons, 23 neutrons, 11 electrons done clear
  B)
                  11 protons, 11 neutrons, 11 electrons done clear
  C)
                  11 protons, 12 neutrons, 11 electrons done clear
  D)
                  11 protons, 11 neutrons, 23 electrons done clear
  View Solution play_arrow

• question_answer30)
  Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\]                                      [CBSE PMT 1990]
  A)
                  \[N{{O}_{2}}\]   done clear
  B)
                  \[{{N}_{2}}O\] done clear
  C)
                  \[NO\]  done clear
  D)
                  \[{{N}_{2}}{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer31)
  The ratio between the neutrons in \[C\] and \[Si\] with respect to atomic masses 12 and 28 is                    [EAMCET 1990]
  A)
                  2 : 3        done clear
  B)
                  3 : 2 done clear
  C)
                  3 : 7        done clear
  D)
                  7 : 3 done clear
  View Solution play_arrow

• question_answer32)
  The atomic number of an element is always equal to [MP PMT 1994]
  A)
                  Atomic weight divided by 2 done clear
  B)
                  Number of neutrons in the nucleus done clear
  C)
                  Weight of the nucleus done clear
  D)
                  Electrical charge of the nucleus done clear
  View Solution play_arrow

• question_answer33)
  Which of the following is isoelectronic with carbon atom [MP PMT 1994; UPSEAT 2000]
  A)
                  \[N{{a}^{+}}\]    done clear
  B)
                  \[A{{l}^{3+}}\] done clear
  C)
                  \[{{O}^{2-}}\]     done clear
  D)
                  \[{{N}^{+}}\] done clear
  View Solution play_arrow

• question_answer34)
  \[C{{O}_{2}}\] is isostructural with [IIT 1986; MP PMT 1986, 94, 95]
  A)
                  \[SnC{{l}_{2}}\] done clear
  B)
                  \[S{{O}_{2}}\] done clear
  C)
                  \[HgC{{l}_{2}}\]                 done clear
  D)
                  All the above done clear
  View Solution play_arrow

• question_answer35)
  The hydride ions \[({{H}^{-}})\] are isoelectronic with [AFMC 1995; Bihar MEE 1997]
  A)
                  \[Li\]      done clear
  B)
                  \[H{{e}^{+}}\] done clear
  C)
                  \[He\]   done clear
  D)
                  \[Be\] done clear
  View Solution play_arrow

• question_answer36)
  The number of electrons in the nucleus of \[{{C}^{12}}\] is [AFMC 1995]
  A)
                  6              done clear
  B)
                  12 done clear
  C)
                  0              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer37)
  An element has electronic configuration 2, 8, 18, 1. If its atomic weight is 63, then how many neutrons will be present in its nucleus               
  A)
                  30           done clear
  B)
                  32 done clear
  C)
                  34           done clear
  D)
                  33 done clear
  View Solution play_arrow

• question_answer38)
  The nucleus of the element \[_{21}{{E}^{45}}\] contains
  A)
                  45 protons and 21 neutrons done clear
  B)
                  21 protons and 24 neutrons done clear
  C)
                  21 protons and 45 neutrons done clear
  D)
                  24 protons and 21 neutrons done clear
  View Solution play_arrow

• question_answer39)
  Neutrons are found in atoms of all elements except in [MP PMT 1997]
  A)
                  Chlorine               done clear
  B)
                  Oxygen done clear
  C)
                  Argon    done clear
  D)
                  Hydrogen done clear
  View Solution play_arrow

• question_answer40)
  The mass number of an anion, \[{{X}^{3-}}\], is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, \[{{X}_{2}}\] of the element will be [MP PMT 1999]
  A)
                  10           done clear
  B)
                  14 done clear
  C)
                  7              done clear
  D)
                  5 done clear
  View Solution play_arrow

• question_answer41)
  Which of the following are isoelectronic species \[I=CH_{3}^{+},\,II-N{{H}_{2}},\,III-NH_{4}^{+},\,IV-N{{H}_{3}}\]             [CPMT 1999]
  A)
                  I, II, III   done clear
  B)
                  II, III, IV done clear
  C)
                  I, II, IV   done clear
  D)
                  I and II done clear
  View Solution play_arrow

• question_answer42)
  The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is  [AIIMS 1996]
  A)
                  \[+1\]    done clear
  B)
                  \[-2\] done clear
  C)
                  \[-1\]     done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer43)
  Number of unpaired electrons in inert gas is       [CPMT 1996]
  A)
                  Zero       done clear
  B)
                  8 done clear
  C)
                  4              done clear
  D)
                  18 done clear
  View Solution play_arrow

• question_answer44)
  In neutral atom, which particles are equivalent [RPMT 1997]
  A)
                  \[{{p}^{+}},\,{{e}^{+}}\]                done clear
  B)
                  \[{{e}^{-}},\,{{e}^{+}}\] done clear
  C)
                  \[{{e}^{-}},{{p}^{+}}\]    done clear
  D)
                  \[{{p}^{+}},{{n}^{o}}\] done clear
  View Solution play_arrow

• question_answer45)
  Nuclei tend to have more neutrons than protons at high mass numbers because              [Roorkee Qualifying 1998]
  A)
                  Neutrons are neutral particles done clear
  B)
                  Neutrons have more mass than protons done clear
  C)
                  More neutrons minimize the coulomb repulsion done clear
  D)
                  Neutrons decrease the binding energy done clear
  View Solution play_arrow

• question_answer46)
  Which one of the following is not isoelectronic with \[{{O}^{2-}}\] [CBSE PMT 1994]
  A)
                  \[{{N}^{3-}}\]     done clear
  B)
                  \[{{F}^{-}}\] done clear
  C)
                  \[T{{l}^{+}}\] done clear
  D)
                  \[N{{a}^{+}}\] done clear
  View Solution play_arrow

• question_answer47)
  The number of electrons in \[{{[_{19}^{40}K]}^{-1}}\] is [CPMT 1997; AFMC 1999]
  A)
                  19           done clear
  B)
                  20 done clear
  C)
                  18           done clear
  D)
                  40 done clear
  View Solution play_arrow

• question_answer48)
  The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is [CPMT 1997; Pb. PMT 1999; MP PMT 1999]
  A)
                  17           done clear
  B)
                  37 done clear
  C)
                  2              done clear
  D)
                  38 done clear
  View Solution play_arrow

• question_answer49)
  Number of protons, neutrons and electrons in the element \[_{89}^{231}Y\] is                                  [AFMC 1997]
  A)
                  89, 231, 89           done clear
  B)
                  89, 89, 242 done clear
  C)
                  89, 142, 89           done clear
  D)
                  89, 71, 89 done clear
  View Solution play_arrow

• question_answer50)
  \[B{{e}^{2+}}\] is isoelectronic with         [EAMCET 1998]
  A)
                  \[M{{g}^{2+}}\]                done clear
  B)
                  \[N{{a}^{+}}\] done clear
  C)
                  \[L{{i}^{+}}\]      done clear
  D)
                  \[{{H}^{+}}\] done clear
  View Solution play_arrow

• question_answer51)
  An isostere is                                     [UPSEAT 1999]
  A)
                  \[NO_{2}^{-}\] and \[{{O}_{3}}\]               done clear
  B)
                  \[NO_{2}^{-}\] and \[PO_{4}^{3-}\] done clear
  C)
                  \[C{{O}_{2}},\,{{N}_{2}}O,\,NO_{3}^{-}\]              done clear
  D)
                  \[ClO_{4}^{-}\] and \[OC{{N}^{-}}\] done clear
  View Solution play_arrow

• question_answer52)
  Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion will be            [Pb. PMT 2000]
  A)
                  8              done clear
  B)
                  16 done clear
  C)
                  32           done clear
  D)
                  64 done clear
  View Solution play_arrow

• question_answer53)
  If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is              [RPET 2000]
  A)
                  2              done clear
  B)
                  8 done clear
  C)
                  4              done clear
  D)
                  16 done clear
  View Solution play_arrow

• question_answer54)
  The nitride ion in lithium nitride is composed of [KCET 2000]
  A)
                  7 protons + 10 electrons done clear
  B)
                  10 protons + 10 electrons done clear
  C)
                  7 protons + 7 protons done clear
  D)
                  10 protons + 7 electrons done clear
  View Solution play_arrow

• question_answer55)
  The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is [CPMT 2001]
  A)
                  Eight      done clear
  B)
                  Six done clear
  C)
                  Three    done clear
  D)
                  Two done clear
  View Solution play_arrow

• question_answer56)
  The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is [UPSEAT 2001]
  A)
                  7              done clear
  B)
                  6 done clear
  C)
                  5              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer57)
  Which of the following is not isoelectronic            [MP PET 2002]
  A)
                  \[N{{a}^{+}}\]    done clear
  B)
                  \[M{{g}^{2+}}\] done clear
  C)
                  \[{{O}^{2-}}\]     done clear
  D)
                  \[C{{l}^{-}}\] done clear
  View Solution play_arrow

• question_answer58)
  The charge of an electron is \[-1.6\times {{10}^{-19}}C.\] The value of free charge on \[L{{i}^{+}}\]ion will be [AFMC 2002; KCET (Engg.) 2002]
  A)
                  \[3.6\times {{10}^{-19}}C\]          done clear
  B)
                  \[1\times {{10}^{-19}}C\] done clear
  C)
                  \[1.6\times {{10}^{-19}}C\]          done clear
  D)
                  \[2.6\times {{10}^{-19}}C\] done clear
  View Solution play_arrow

• question_answer59)
  Iso-electronic species is                [RPMT 2002]
  A)
                  \[{{F}^{-}},\,\,{{O}^{-2}}\]            done clear
  B)
                  \[{{F}^{-}},\,\,O\] done clear
  C)
                  \[{{F}^{-}},\,\,{{O}^{+}}\]             done clear
  D)
                  \[{{F}^{-}},\,\,{{O}^{+2}}\] done clear
  View Solution play_arrow

• question_answer60)
  An element have atomic weight 40 and it?s electronic configuration is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}.\] Then its atomic number and number of neutrons will be               [RPMT 2002]
  A)
                  18 and 22             done clear
  B)
                  22 and 18 done clear
  C)
                  26 and 20             done clear
  D)
                  40 and 18 done clear
  View Solution play_arrow

• question_answer61)
  The nucleus of tritium contains  [MP PMT 2002]
  A)
                  1 proton + 1 neutron      done clear
  B)
                  1 proton + 3 neutron done clear
  C)
                  1 proton + 0 neutron      done clear
  D)
                  1 proton + 2 neutron done clear
  View Solution play_arrow

• question_answer62)
  Which one of the following groupings represents a collection of isoelectronic species     [AIEEE 2003]
  A)
                  \[N{{a}^{+}},\,C{{a}^{2+}},M{{g}^{2+}}\]               done clear
  B)
                  \[{{N}^{3-}},\,{{F}^{-}},\,N{{a}^{+}}\] done clear
  C)
                  \[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\]  done clear
  D)
                  \[C{{a}^{2+}},\,C{{s}^{+}},\,Br\] done clear
  View Solution play_arrow

• question_answer63)
  Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\]            [IIT Screening 2003]
  A)
                  \[NO_{3}^{-},\,CO_{3}^{2-}\]     done clear
  B)
                  \[S{{O}_{3}},\,NO_{3}^{-}\] done clear
  C)
                  \[ClO_{3}^{-},\,CO_{3}^{2-}\] done clear
  D)
                  \[CO_{3}^{2-},\,S{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer64)
  The number of electrons in \[C{{l}^{-}}\] ion is   [MP PMT 2003]
  A)
                  19           done clear
  B)
                  20 done clear
  C)
                  18           done clear
  D)
                  35 done clear
  View Solution play_arrow

• question_answer65)
  The number of neutron in tritium is         [CPMT 2003]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  0 done clear
  View Solution play_arrow

• question_answer66)
  Tritium is the isotope of                [CPMT 2003]
  A)
                  Hydrogen            done clear
  B)
                  Oxygen done clear
  C)
                  Carbon done clear
  D)
                  Sulpher done clear
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• question_answer67)
  The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of that element                    [EAMCET (Engg.) 2003]
  A)
                  6              done clear
  B)
                  11 done clear
  C)
                  17           done clear
  D)
                  23 done clear
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• question_answer68)
  The nucleus of an element contain 9 protons. Its valency would be                          [MP PET 2004]
  A)
                  1              done clear
  B)
                  3 done clear
  C)
                  2              done clear
  D)
                  5 done clear
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• question_answer69)
  The compound in which cation is isoelectronic with anion is [UPSEAT 2004]
  A)
                  \[NaCl\]               done clear
  B)
                  \[CsF\] done clear
  C)
                  \[NaI\]  done clear
  D)
                  \[{{K}_{2}}S\] done clear
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• question_answer70)
  Which among the following species have the same number of electrons in its outermost as well as penultimate shell [DCE 2004]
  A)
                  \[M{{g}^{2+}}\]                done clear
  B)
                  \[{{O}^{2-}}\] done clear
  C)
                  \[{{F}^{-}}\]        done clear
  D)
                  \[C{{a}^{2+}}\] done clear
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• question_answer71)
  Six protons are found in the nucleus of [CPMT 1977, 80, 81; NCERT 1975, 78]
  A)
                  Boron    done clear
  B)
                  Lithium done clear
  C)
                  Carbon done clear
  D)
                  Helium done clear
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• question_answer72)
  The nitrogen atom has 7 protons and 7 electrons, the nitride ion \[({{N}^{3-}})\]will have                              [NCERT 1977]
  A)
                  7 protons and 10 electrons done clear
  B)
                  4 protons and 7 electrons done clear
  C)
                  4 protons and 10 electrons done clear
  D)
                  10 protons and 7 electrons done clear
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• question_answer73)
  Number of neutrons in heavy hydrogen atom is [MP PMT 1986]
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  3 done clear
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• question_answer74)
  Which of the following is always a whole number [CPMT 1976, 81, 86]
  A)
                  Atomic weight   done clear
  B)
                  Atomic radii done clear
  C)
                  Equivalent weight            done clear
  D)
                  Atomic number done clear
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