What all halogens have in common
What all halogens have in common
Group 7 elements are called halogens, and chlorine, bromine and iodine are all non-metals in this family. Each atom has seven electrons in its outer shell, so each atom needs to gain one more electron to get a full outer shell.
Step-by-step lessons on Edexcel IGCSE Chemistry Group 7 (halogens) – chlorine, bromine and iodine. Each one builds up to exam-style questions. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.