◄Previous: Introduction

# Learning outcomes

After studying Session 4 you should be able to:

- understand how the concept of valency can account for, and predict the formulas of compounds
- sketch Lewis structures of molecules and ions
- identify situations where and appreciation of dative bonding is required to account for the bonding in certain molecules and ions
- appreciate some molecules are not adequately represented by a single Lewis structure and seem to be a composite of two or more resonance structures.
◄Contents►Next: 1 More about chemical bonding

OpenLearn - Discovering chemistry
Except for third party materials and otherwise, this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, full copyright detail can be found in the acknowledgements section. Please see full copyright statement for details.