Metals, non-metals and compounds In this OCR GCSE Chemistry study guide ... Sample exam questions - chemical patterns Understanding how to approach exam questions helps to boost exam performance.

Scientists have long been intrigued by a mechanism first predicted by Alan Turing that leads to self-organizing chemical patterns. Now they have a guide to creating them experimentally. You have ...

The covalent radius (a measure of how large individual atoms are) shows different trends if you are moving across a period or down a group. A comparison of the relative covalent radii of atoms is ...