AQA GCSE Combined Science Trilogy · 8464
Specification 5.1.2.1, 5.1.2.3, 6.6.1.2 · Paper 3, Paper 6
A horizontal row of the periodic table. Its number tells you how many electron shells are occupied in an atom.
Revise: Periodic Table OrganizationThe horizontal rows are called periods. The word periodic means that a pattern repeats: as atomic number increases, similar chemical properties recur at regular intervals.
- Revise: Metals and Non-Metals
- Revise: Wave Properties and Calculations
The time taken for one complete wave to pass a point, or for one complete oscillation. Its symbol is and its unit is the second (s).