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

Particles in the Atom & Atomic Radius (Cambridge (CIE) AS 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)

Which row gives 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 gives the correct description of atomic number, proton number and mass number?

    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.

      Which row gives 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 row gives 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 gives 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 species is X?

            • 40Ca+

            • 39K+

            • 38Ar

            • 45Sc

            Choose your answer

            1
            1 mark

            Which species contains different numbers of protons, neutrons and electrons?

            • 23Na+

            • 27Al

            • 19F-

            •  32S2-

            Choose your answer

            2
            1 mark

            Which statement explains why atoms are neutral?

            • One proton has a mass 1836 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 gives the correct number of subatomic particles 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.

                  Which row gives the correct order of ionic radii 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 statement about the trend in atomic radius across Period 3 is not correct?

                    • Electron 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