IGCSE›Cambridge IGCSE Chemistry›Mind mapsArrangement of ElementsCambridge IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsHow it's arrangedIncreasing proton numberColumns are groupsRows are periodsGroupsGroup number = outer shell electronsSame group → similar chemical propertiesChemistry uses the outer electronsPeriodsPeriod number = occupied shellsMetals on the leftNon-metals on the rightGradual change in character acrossPeriodic TablearrangementIIIVII0Ion chargeGroup I forms 1+ ionsGroup II forms 2+ ionsGroup VI forms 2− ionsGroup VII forms 1− ionsPredictingUse position to predict propertiesFollow trends in the same groupPeriod 3: Na and Mg are metals, Cl and Ar non-metalsExam tipsGroups I–III lose electrons → positive ionsGroups V–VII gain electrons → negative ionsDo not confuse group number with charge sign