A LevelChemistryCambridge (CIE)Exam Questions1. Atomic StructureParticles in the Atom & Atomic Radius

Particles in the Atom & Atomic Radius (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

1 hour22 questions

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Particles in the Atom & Atomic Radius

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1
1 mark

The reaction shown occurs in gas clouds throughout the Universe.

H2 (g) + H2+ (g) → H (g) + H3+ (g)

What is the atomic structure of the H3+ ion?

 

protons

neutrons

electrons

A

3

0

1

B

3

0

2

C

2

1

1

D

2

1

2

    Choose your answer

    2
    1 mark

    Which row is correct?

    the atomic number is the number of

    the proton number is the number of

    the mass number is the number of

    A

    atoms

    protons

    protons

    B

    electrons

    neutrons

    nucleons

    C

    electrons

    neutrons

    protons

    D

    protons

    protons

    nucleons

      Choose your answer

      3
      1 mark

      The phosphide ion, begin mathsize 16px style P presubscript 15 presuperscript 32 superscript 3 minus sign end superscript end style, is used in medicine as a radioactive treatment for some forms of cancer.

      What is the composition of the phosphide ion?

      protons

      neutrons

      electrons

      A

      15

      17

      32

      B

      15

      17

      18

      C

      17

      15

      15

      D

      17

      15

      32

        Choose your answer

        4
        1 mark

        Which option correctly describes the relative charges and masses of the subatomic particles?

        proton

        neutron

        electron

        the relative mass of an electron

        A

        +1

        0

        −1

        1

        B

        0

        +1

        +1

        \frac{1}{1836}

        C

        +1

        0

        −1

        \frac{1}{1836}

        D

        0

        +1

        −1

        1

          Choose your answer

          5
          1 mark

          Which row correctly describes the characteristics of the nucleus and surrounding space?

           

          Nucleus

          Surrounding space

          A

          Small, dense and neutral

          Mainly empty space

          B

          Large, dense and positive

          Densely populated with electrons

          C

          Large, dense and neutral

          Densely populated with electrons

          D

          Small, dense and positive

          Mainly empty space

            Choose your answer

            6
            1 mark

            X is a particle with 19 electrons and 20 neutrons. 

            Which of the species is X?

            • 40Ca+

            • 39K+

            • 38Ar

            • 45Sc

            Choose your answer

            1
            1 mark

            In which of the following species are the numbers of protons, neutrons and electrons all different?

            • 23Na+

            • 27Al

            • 19F-

            •  32S2-

            Choose your answer

            2
            1 mark

            Which statement explains why atoms are neutral?

            • One proton has a mass 1840 times greater than one electron.

            • The charge on an electron is equal and opposite to the charge on a proton.

            • The difference in charge between electrons and protons is balanced by the neutrons.

            • Electrons are spread out in shells around the nucleus while protons are concentrated inside the nucleus.

            Choose your answer

            3
            1 mark

            Which statement about atomic radius in Group I elements Na to Rb is not correct?

            • Increases moving down the group

            • Increases moving down due to the addition of electron shells 

            • Decreases moving down due to increasing nuclear forces

            • Rb has the greatest atomic radius

            Choose your answer

            4
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            1 mark

            Which row gives the correct number of protons, neutrons and electrons in the straight P presubscript 15 presuperscript 31 superscript 3 minus end superscript ion?

            Protons

            Neutrons

            Electrons

            A

            15

            16

            18

            B

            16

            15

            16

            C

            16

            15

            18

            D

            15

            15

            15

              Choose your answer

              5
              1 mark

              Which row correctly describes the subatomic particles found in 26Mg2+?

                           

                   protons        

                   neutrons      

                   electrons       

              A

              10

              14

              12

              B

              12

              14

              10

              C

              12

              26

              10

              D

              14

              12

              12

                Choose your answer

                6
                1 mark

                The table below shows the number of protons, neutrons, and electrons in four different particles.

                Which row represents the 31P3− ion?

                particle

                protons

                neutrons

                electrons

                A

                15

                16

                15

                B

                15

                16

                18

                C

                16

                16

                18

                D

                16

                17

                16

                  Choose your answer

                  1
                  1 mark

                  The species Cl−, K+ and Ar are isoelectronic. This means that they have the same number of electrons.

                  In which order do their radii decrease from largest to smallest?

                  1st

                  2nd

                  3rd

                  A

                  K+

                  Cl−

                  Ar

                  B

                  Cl−

                  Ar

                  K+

                  C

                  K+

                  Ar

                  Cl−

                  D

                  Ar

                  K+

                  Cl−

                    Choose your answer

                    2
                    1 mark

                    The trajectories of subatomic particles shot through an electric field produced in a vacuum are shown in the diagram.

                    Diagram of a particle beam passing between charged plates, showing electrons deflected to the positive plate, protons to the negative plate, and neutrons unaffected

                    Which statement is not correct?

                    • The proton and electron are deflected because they are charged particles.

                    •  The neutrons are undeflected as they have no charge.

                    • The electron is deflected more than the proton because it has less mass.

                    • The particles travel at different speeds

                    Choose your answer

                    3
                    1 mark

                    Which of the following statements about the trend in atomic radius across Period 3 is not correct?

                    • Electrons shells are added moving across the period which increases the nuclear force of attraction

                    • The nuclear charge increases moving across due to increasing atomic number

                    • There is a greater force of attraction between the nucleus and the electrons

                    • The atomic radius decreases across the period 

                    Choose your answer

                    4
                    1 mark

                    What is the total number of protons and electrons in 2 moles of lithium ions, Li+?

                    • 2.4 × 1024

                    • 3.6 × 1024

                    • 6.0 × 1024

                    • 7.2 × 1024

                    Choose your answer