Model of the atom GapFill

All matter is made up of  chargesmoleculesenergyatomscellsions, which come in different types, called  atomsreactantsmoleculeselementsmetalsparticles, represented using symbols which can be found on the  Internetgroup seriesperiodic tableatomic modelcompound sequencereactivity list. When these react together,  atomscompoundsprotonsnoble gasesbeta particlesmixtures are formed, which have formulae to show the  importancepercentagepositionchargeratiosize of each element.  HalogensElectronsMixturesMetalsPure substancesNeutrons contain multiple elements or compounds, and can be  meltedshapedreactedbondedfusedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakeplum puddingstrawberry shortcakedough balldoughnutupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticelectronicnuclearconnectivemagneticdirectional model - based on the observations of  beta particlehalogenalpha particleradiationmetallicgamma particle scattering
•  Marie CurieIsaac NewtonNeil ArmstrongTheodore RooseveltNiels BohrAlbert Einstein's model, where electrons orbit the nucleus
•  Francis DrakeJames ChadwickAlexander FlemingDmitri MendeleevCharles DarwinJames Dalton's model, where neutrons are also in the nucleus

Different  subatomicmagneticalphaomegainfraredultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  210-110.512, 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  compoundsprotonsisotopesbondsionssalts.