Edexcel A-Level Chemistry AS 3.20 Metals Consist of Giant Lattices of Metal Ions in a Sea of Delocalised Electrons Topic Practice

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Pearson Edexcel IAL Chemistry

Unit 1: Structure, Bonding and Introduction to Organic Chemistry

Topic 1: Formulae, Equations and Amount of Substance

Topic 2: Atomic Structure and the Periodic Table

Topic 3: Bonding and Structure

3.1—Interpret evidence for the existence of ions

3.2—The formation of ions in terms of loss or gain of electrons

3.3—Draw dot-and-cross diagrams to show electrons in cations and anions

3.4—Ionic crystals as giant lattices of ions

3.5—Ionic bonding is the result of strong net electrostatic attraction between ions

3.6—The effects of ionic radius and ionic charge on the strength of ionic bonding

3.7—Reasons for the trends in ionic radii down a group in the Periodic Table, and for a set of isoelectronic ions

3.8—The meaning of the term ‘polarisation’ as applied to ions

3.9—The polarising power of a cation depends on its radius and charge, and the polarisability of an anion also depends on its

3.10—Covalent bonding is the strong electrostatic attraction between two nuclei and the shared pair of electrons between them

3.11—Draw dot-and-cross diagrams to show electrons in covalent substances

3.12—The different structures formed by giant lattices of carbon atoms

3.13—The meaning of the term ‘electronegativity’ as applied to atoms in a covalent bond

3.14—Ionic and covalent bonding are the extremes of a continuum of bonding type

3.15—Distinguish between polar bonds and polar molecules and predict whether or not a given molecule is likely to be polar

3.16—The principles of the electron-pair repulsion theory, used to interpret and predict the shapes of simple molecules and ions

3.17—The terms ‘bond length’ and ‘bond angle’

3.18—And explain the shapes of, and bond angles in, BeCl2, BCl3, CH4, NH3, NH4+, H2O, CO2, gaseous PCl5, SF6 and C2H4

3.19—Apply the electron-pair repulsion theory to predict the shapes of, and bond angles in, molecules and ions analogous to those

3.20—Metals consist of giant lattices of metal ions in a sea of delocalised electrons

3.21—Metallic bonding is the strong electrostatic attraction between metal ions and the delocalised electrons

3.22—The models in 3.20 and 3.21 to interpret simple properties of metals

Topic 4: Introductory Organic Chemistry and Alkanes

Topic 5: Alkenes

Unit 2: Energetics, Group Chemistry, Halogenoalkanes and Alcohols

Unit 3: Practical Skills in Chemistry I

Assessed mathematical skills and measurement conventions

A-Level/Edexcel/Chemistry//AS/Question Bank/Unit 1: Structure, Bonding and Introduction to Organic Chemistry/Topic 3: Bonding and Structure/3.20—Metals consist of giant lattices of metal ions in a sea of delocalised electrons

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