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Atoms, Elements and Compounds

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Atomic structure and the Periodic Table

Subtopic

Atomic structure and the Periodic Table under Atoms, Elements and Compounds for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the general trend for the reactivity and melting points of Group I alkali metals as you move down the group?

    A.

    Reactivity decreases and melting point increases

    B.

    Reactivity increases and melting point increases

    C.

    Reactivity decreases and melting point decreases

    D.

    Reactivity increases and melting point decreases

  2. 2.

    Which group in the Periodic Table is characterized by being entirely composed of non-metals that are monatomic and chemically unreactive?

    A.

    Group I

    B.

    Group VIII (0)

    C.

    Group VII

    D.

    Group II

  3. 3.

    How many protons, neutrons, and electrons are present in an ion of the isotope 1737Cl−^{37}_{17}\text{Cl}^{-}?

    A.

    17 protons, 17 neutrons, 18 electrons

    B.

    18 protons, 20 neutrons, 17 electrons

    C.

    17 protons, 20 neutrons, 18 electrons

    D.

    20 protons, 17 neutrons, 18 electrons

Download the worksheet for Atoms, Elements and Compounds - Atomic structure and the Periodic Table to practice offline. It includes additional chapter-level practice questions.

Isotopes

Subtopic

Isotopes under Atoms, Elements and Compounds for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following describes a use of the radioactive isotope Cobalt-60?

    A.

    As a fuel in nuclear reactors

    B.

    For dating archaeological artifacts

    C.

    In the treatment of cancer (radiotherapy)

    D.

    To check for leaks in oil pipes

  2. 2.

    Why do isotopes of the same element, such as 12C^{12}C and 14C^{14}C, exhibit identical chemical properties?

    A.

    They have the same number of neutrons in the nucleus.

    B.

    They have the same nucleon number.

    C.

    They have the same number of electrons in their outer shell.

    D.

    They have the same nuclear mass.

  3. 3.

    An atom of an isotope of sulfur is represented by the symbol 1634S^{34}_{16}S. How many neutrons are present in the nucleus of this atom?

    A.

    16

    B.

    34

    C.

    18

    D.

    50

Download the worksheet for Atoms, Elements and Compounds - Isotopes to practice offline. It includes additional chapter-level practice questions.

Ionic bonding

Subtopic

Ionic bonding under Atoms, Elements and Compounds for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the correct electronic charge for a sulfide ion, formed from an atom in Group 16 (VI) of the Periodic Table?

    A.

    1+1+

    B.

    2+2+

    C.

    1−1-

    D.

    2−2-

  2. 2.

    Which of the following pairs of elements is most likely to form a compound with ionic bonding?

    A.

    Carbon and Oxygen

    B.

    Nitrogen and Hydrogen

    C.

    Magnesium and Fluorine

    D.

    Sulfur and Chlorine

  3. 3.

    What is the primary reason why ionic compounds typically have very high melting and boiling points?

    A.

    Strong electrostatic forces of attraction between oppositely charged ions.

    B.

    Strong covalent bonds within the molecules.

    C.

    The presence of a sea of delocalized electrons.

    D.

    Weak intermolecular forces that are easy to overcome.

Download the worksheet for Atoms, Elements and Compounds - Ionic bonding to practice offline. It includes additional chapter-level practice questions.

Covalent bonding

Subtopic

Covalent bonding under Atoms, Elements and Compounds for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In a molecule of methane (CH4CH_4), how many shared pairs of electrons are involved in the bonding of the entire molecule?

    A.

    2

    B.

    3

    C.

    4

    D.

    8

  2. 2.

    Which of these substances is an example of a simple molecular covalent compound?

    A.

    H2OH_2O

    B.

    NaClNaCl

    C.

    MgOMgO

    D.

    FeFe

  3. 3.

    Nitrogen gas (N2N_2) is a common diatomic molecule. How many covalent bonds exist between the two nitrogen atoms?

    A.

    A single covalent bond

    B.

    A double covalent bond

    C.

    A triple covalent bond

    D.

    A quadruple covalent bond

Download the worksheet for Atoms, Elements and Compounds - Covalent bonding to practice offline. It includes additional chapter-level practice questions.

Macromolecules and metallic bonding

Subtopic

Macromolecules and metallic bonding under Atoms, Elements and Compounds for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which molecule or macromolecule has a structure similar to that of diamond?

    A.

    Graphite

    B.

    Silicon(IV) oxide (SiO2SiO_2)

    C.

    Buckminsterfullerene (C60C_{60})

    D.

    Sodium chloride (NaClNaCl)

  2. 2.

    Why is graphite used as a lubricant in machinery?

    A.

    It has a high melting point and does not decompose

    B.

    Its layers can slide over each other due to weak forces between them

    C.

    It contains delocalized electrons that reduce friction

    D.

    It is a giant covalent molecule with very high hardness

  3. 3.

    In the structure of diamond, how many other carbon atoms is each carbon atom covalently bonded to?

    A.

    2

    B.

    3

    C.

    4

    D.

    6

Download the worksheet for Atoms, Elements and Compounds - Macromolecules and metallic bonding to practice offline. It includes additional chapter-level practice questions.

Atoms, Elements and Compounds - Grade 12 Chemistry (IGCSE) | Krit.club