3.1/3.2

Structure 2.1-The ionic model

Guiding question: What determines the ionic nature and properties of a compound?

Structure 2.1.1

  • When metal atoms lose electrons, they form positive ions called cations.

  • When non-metal atoms gain electrons, they form negative ions called anions.

  • Predict the charge of an ion from the electron configuration of the atom.

Structure 2.1.2

  • The ionic bond is formed by electrostatic attractions between oppositely charged ions.

  • Deduce the formula and name of an ionic compound from its component ions, including polyatomic ions.

  • Binary ionic compounds are named with the cation first, followed by the anion. The anion adopts the suffix "ide".

  • Interconvert names and formulas of binary ionic compounds.


Structure 2.1.3

  • Ionic compounds exist as three-dimensional lattice structures, represented by empirical formulas.

  • Explain the physical properties of ionic compounds to include volatility, electrical conductivity and solubility.

  • Include lattice enthalpy as a measure of the strength of the ionic bond in different compounds, influenced by ion radius and charge.

Structure 2.3-The metallic model

Guiding question: What determines the metallic nature and properties of an element

  • Structure 2.3.1

  • A metallic bond is the electrostatic attraction between a lattice of cations and delocalized electrons.

  • Explain the electrical conductivity, thermal conductivity and malleability of metals.

Structure 2.3.2

  • The strength of a metallic bond depends on the charge of the ions and the radius of the metal ion.

  • Explain trends in melting points of s and p block metals.

Structure 2.4-From models to materials

Guiding question: What role do bonding and structure have in the design of materials?


Structure 2.3.2

  • The strength of a metallic bond depends on the charge of the ions and the radius of the metal ion.

  • Explain trends in melting points of s and p block metals.

Structure 2.4-From models to materials

Guiding question: What role do bonding and structure have in the design of materials?

Structure 2.4.3

  • Alloys are mixtures of a metal and other metals or non-metals. They have enhanced properties.

  • Explain the properties of alloys in terms of non-directional bonding.