Model of the atom GapFill

All matter is made up of  cellsionsenergyatomschargesmolecules, which come in different types, called  reactantsmoleculesatomselementsparticlesmetals, represented using symbols which can be found on the  reactivity listgroup seriescompound sequenceInternetatomic modelperiodic table. When these react together,  beta particlesatomsmixturesprotonsnoble gasescompounds are formed, which have formulae to show the  ratioimportancesizepositionpercentagecharge of each element.  HalogensMetalsPure substancesMixturesElectronsNeutrons contain multiple elements or compounds, and can be  shapedseparatedmeltedbondedreactedfused using filtration, distillation, crystallisation and chromatography.

Over time, different scientists have developed new models of the atom. These include:

• the  plum puddingcheesecakedough ballstrawberry shortcakedoughnutupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nucleardirectionalconnectiveelasticelectronicmagnetic model - based on the observations of  metallicgamma particlehalogenradiationbeta particlealpha particle scattering
•  Niels BohrIsaac NewtonAlbert EinsteinMarie CurieNeil ArmstrongTheodore Roosevelt's model, where electrons orbit the nucleus
•  Alexander FlemingJames DaltonCharles DarwinJames ChadwickDmitri MendeleevFrancis Drake's model, where neutrons are also in the nucleus

Different  magneticinfraredsubatomicomegaultrasonicalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.51-112102, and electrons (negative particles) have a very small mass. The relative atomic mass of an atom is the weighted average mass of all of the element's  compoundsbondsionsisotopesprotonssalts.