Model of the atom GapFill

All matter is made up of  moleculescellschargesionsatomsenergy, which come in different types, called  moleculesatomselementsmetalsparticlesreactants, represented using symbols which can be found on the  periodic tablecompound sequencegroup seriesatomic modelreactivity listInternet. When these react together,  compoundsmixturesnoble gasesatomsbeta particlesprotons are formed, which have formulae to show the  sizepositionchargepercentageratioimportance of each element.  HalogensPure substancesNeutronsMetalsMixturesElectrons contain multiple elements or compounds, and can be  bondedseparatedmeltedfusedshapedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakedoughnutdough ballplum puddingupside-down pineapplecheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectivedirectionalelectronicmagneticnuclearelastic model - based on the observations of  beta particlemetallicalpha particlehalogenradiationgamma particle scattering
•  Neil ArmstrongMarie CurieNiels BohrAlbert EinsteinIsaac NewtonTheodore Roosevelt's model, where electrons orbit the nucleus
•  James ChadwickAlexander FlemingFrancis DrakeCharles DarwinDmitri MendeleevJames Dalton's model, where neutrons are also in the nucleus

Different  infraredmagneticomegasubatomicalphaultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.5-1121210, 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  saltscompoundsbondsprotonsionsisotopes.