BONDING VOCABULARY IGCSE CHAPTER 4 VOCABULARY WORDS Periodic Table History:DöbereinerNewlandsMendeleevMoseleyPeriodic Table TrendsAtomic RadiusIonic RadiusElectronegativityIonization energyMelting point trendMetallic characterelementcompoundformulaformulaechemical changeword equationchemical equationexothermic reactionendothermic reactionunreactiveioncationanionlatticesaltoxidetransition metalcompound ionmoleculediatomicionic bondcovalent bondsingle covalent bonddouble covalent bondtriple covalent bondpolar covalent bondnon polar covalent bondcovalent compoundsShapes of Molecules tetrahedral moleculetrigonal pyramidal moleculebent moleculelinear moleculetrigonal planar moleculesolubleconductorinsulatorvolatilegiant structuresmacromoleculesallotropes