IGCSE›Oxford AQA IGCSE Chemistry›Mind mapsChemical BondingOxford AQA IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhy bond?A compound has two or more elements chemically combinedAtoms lack a full outer shellBonding gives a stable noble-gas arrangementIonicElectrons transferred: metal to non-metalMetal forms positive ion, non-metal negative ionHeld by strong electrostatic attractionBondingionic, covalent, metallicCovalentPairs of electrons sharedUsually non-metal with non-metalShared pair counts for both atoms' outer shellsForms molecules or giant structuresMetallicDelocalised electrons, free to moveGiant lattice of positive ionsAttraction between ions and electron seaExam tipsCheck for metal, non-metal or only metal atomsMetal + non-metal: ionicNon-metal + non-metal: covalentMetal only: metallic