F331 - Chemistry for life - Module 1 - (EL) Elements of Life - Bonding and the shapes of molecules


Bonding and structure

(m) 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

describe some limitations of these models

(n) 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

(o) 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)