Periodicity - the full topic. A level Chemistry explained 00:00 Introduction 00:39 Periodicity and blocks 02:28 Atomic Radius 05:04 Electronegativity 08:36 Ionisation energy 10:32 Ionisation energy across a period 12:14 Ionisation energy exceptions 16:09 Ionisation energy & groups 17:01 States of Matter and forces 19:55 Melting Point across period 3 28:09 Summary