Model of the atom GapFill

All matter is made up of  cellsionschargesenergyatomsmolecules, which come in different types, called  moleculesparticlesatomselementsmetalsreactants, represented using symbols which can be found on the  compound sequenceInternetatomic modelgroup seriesperiodic tablereactivity list. When these react together,  mixturescompoundsbeta particlesatomsprotonsnoble gases are formed, which have formulae to show the  importanceratiochargepercentagepositionsize of each element.  HalogensElectronsMetalsNeutronsMixturesPure substances contain multiple elements or compounds, and can be  reactedshapedmeltedfusedseparatedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutcheesecakeplum puddingstrawberry shortcakeupside-down pineappledough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearelasticdirectionalmagneticelectronicconnective model - based on the observations of  halogenmetallicradiationgamma particlebeta particlealpha particle scattering
•  Neil ArmstrongAlbert EinsteinNiels BohrMarie CurieIsaac NewtonTheodore Roosevelt's model, where electrons orbit the nucleus
•  Francis DrakeDmitri MendeleevCharles DarwinJames ChadwickAlexander FlemingJames Dalton's model, where neutrons are also in the nucleus

Different  subatomicalphainfraredmagneticultrasonicomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10.512210-1, 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  protonsionsbondscompoundsisotopessalts.