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O LevelChemistryCambridgeExam Questions2. Atoms, Elements & Compounds2.2 Atomic Structure & the Periodic Table

Atomic Structure & the Periodic Table (Cambridge O Level Chemistry)

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2.2 Atomic Structure & the Periodic Table

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2.2 Atomic Structure & the Periodic Table

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11 mark

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

  Proton Neutron Electron Relative mass of proton
A +1 0 0 0.00054
B 0 +1 +1 1
C 0 +1 -1 0.00054
D +1 0 -1 1

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    21 mark

    The atomic number of element Q is 9 and its mass number is 19.

    In which group of the Periodic Table should element Q be placed?

    • Group 0

    • Group I

    • Group VII

    • Group II

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    31 mark

    The diagram shows the atomic structure of an element.

    q3-2-1-mcq-easy-cie-igcse-che

    Which element is it?

    • Carbon

    • Beryllium

    • Oxygen

    • Boron

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    11 mark

    The structure of four particles is described in the table.

    Particle Number of protons Number of neutrons Number of electrons
    Li 3 X 3
    Li+ 3 4 2
    F Y 10 9
    F- 9 10 Z

    What are the correct values for X, Y and Z?

      X Y Z
    A 4 7 9
    B 3 9 9
    C 4 9 10
    D 3 7 10

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      21 mark

      Element X contains 12 of each sub-atomic particle.

      What is the correct Group number for element X?

      • Group 0

      • Group I

      • Group VII

      • Group II

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      31 mark

      Element X contains 4 electrons in its outer shell and 125 neutrons in its nucleus. What is element X?

      • Beryllium

      • Carbon

      • Tin

      • Lead

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      41 mark

      Potassium fluoride is an ionic compound formed when one atom of potassium bonds with one atom of fluorine.

      Which row correctly describes the charge and electronic configuration of each ion in the compound?

        Potassium ion Fluorine ion
      A 1 -  2, 8, 8 1 + 2, 8
      B 1 + 2, 8, 8 1 - 2, 8
      C 1 + 2, 8, 8 ,1 1 - 2, 7
      D 1 - 2, 8, 8, 2 1 + 2, 6

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        51 mark

        A section of the Periodic Table is shown below.

        q5-2-1-mcq-easy-cie-igcse-chemistry

        The electronic structure of elements W, X, Y and Z are shown in the table.

          Electronic structure
        W 2, 1
        X 2, 4
        Y 2, 8, 2
        Z 2, 8

        Which elements have the correct electronic structure?

        A  W and X
        B  Y and Z
        C  W and Y
        D  X and Z

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          61 mark

          Elements X and Y combine to form an ionic compound.

          Atoms of X have more protons than atoms of Y.

          Atoms of Y have more valence electrons than atoms of X.

          Which statement is correct?

          • Ions of X are negatively charged.

          • Atoms of X have more electron shells than atoms of Y.

          • X and Y are in the same period of the Periodic Table.

          • X and Y are in the same group of the Periodic Table.

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          71 mark

          The ion Q2+ has three complete shells of electrons.

          What is Q?

          • calcium

          • magnesium

          • oxygen

          • sulfur

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          11 mark

          The X+ ion of element X has 16 electrons and a nucleon number of 37. 

          What is the correct Group number for element X?

          • VII

          • VIII

          • III

          • I

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          21 mark

          Which row of the table correctly describes the link between outer shell electrons, Group number and Period number?

            outer electrons same as group number same as period number same as
          A group number period number outer electrons
          B period number group number outer electrons
          C group number outer electrons number of electron shells
          D outer electrons group number number of electron shells

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            31 mark

            A selenide ion has the following notation.

            Se presubscript 34 presuperscript 79 superscript 2 minus end superscript

            Which row correctly describes the subatomic particles in a selenide ion?

              Protons Neutrons Electrons
            A 79 34 34
            B 34 45 34
            C 34 45 36
            D 45 34 32

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