F332 - Module 1 (ES) Elements from the Sea

Bonding and structure

Draw and interpret simple electron ‘dot-and-cross’ diagrams to show how atoms bond through ionic, covalent and dative covalent bonds and be able to describe a simple model of metallic bonding

Use the electron pair repulsion principle to predict and explain the shapes of simple molecules (such as CH4, NH3, H2O and SF6) and ions (such as NH4 +) with up to six outer pairs of electrons (any combination of bonding pairs and lone pairs) (no treatment of hybridisation or molecular orbitals is expected)

Recall the typical physical properties (melting point, solubility in water, ability to conduct electricity) characteristic of giant lattice (metallic, ionic, covalent network) and simple molecular structure types

Explain the term electronegativity

Recall qualitatively the electronegativity trends in the Periodic Table

Use relative electronegativity values to predict bond polarity in a covalent bond

Decide whether a molecule is polar or non-polar from its shape and the polarity of its bonds

Explain, give examples of, and recognise in given examples the following types of intermolecular bonds:

Describe the structure of an ionic lattice and be able to draw the structure of compounds that have the sodium chloride lattice