Model of the atom GapFill

All matter is made up of  chargescellsatomsionsmoleculesenergy, which come in different types, called  elementsmetalsreactantsatomsparticlesmolecules, represented using symbols which can be found on the  Internetperiodic tablecompound sequenceatomic modelreactivity listgroup series. When these react together,  mixturesbeta particlescompoundsnoble gasesatomsprotons are formed, which have formulae to show the  sizechargeratiopercentagepositionimportance of each element.  ElectronsMixturesHalogensMetalsPure substancesNeutrons contain multiple elements or compounds, and can be  shapedmeltedseparatedbondedreactedfused using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutupside-down pineappleplum puddingdough ballcheesecakestrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  directionalconnectivemagneticelasticnuclearelectronic model - based on the observations of  gamma particleradiationbeta particlemetallicalpha particlehalogen scattering
•  Marie CurieNeil ArmstrongTheodore RooseveltNiels BohrAlbert EinsteinIsaac Newton's model, where electrons orbit the nucleus
•  Charles DarwinJames DaltonDmitri MendeleevJames ChadwickFrancis DrakeAlexander Fleming's model, where neutrons are also in the nucleus

Different  omegaalphainfraredultrasonicmagneticsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10120.52-11, 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  saltsisotopesprotonscompoundsbondsions.