This document is a structured revision guide covering four main science topics:

1. The Periodic Table: Summarizes Mendeleev's design, element properties (metals vs. non-metals), and electron blocks.

2. Radioactivity: Details types of radiation (Alpha, Beta, Gamma), half-life calculations, and safety protocols.

3. Electricity: Explains the differences between series/parallel circuits and AC/DC current, including Ohm's law.

4. The Electromagnetic Spectrum: Lists the uses for all wave typ...