Model of the atom GapFill

All matter is made up of  cellsmoleculesatomsenergychargesions, which come in different types, called  particlesatomselementsmoleculesreactantsmetals, represented using symbols which can be found on the  group seriesInternetatomic modelperiodic tablecompound sequencereactivity list. When these react together,  atomsnoble gasesprotonscompoundsbeta particlesmixtures are formed, which have formulae to show the  chargeratiopositionpercentagesizeimportance of each element.  MixturesNeutronsHalogensPure substancesElectronsMetals contain multiple elements or compounds, and can be  separatedbondedreactedmeltedfusedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingdoughnutupside-down pineappledough ballcheesecakestrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nucleardirectionalelasticconnectiveelectronicmagnetic model - based on the observations of  radiationhalogenmetallicalpha particlebeta particlegamma particle scattering
•  Isaac NewtonNeil ArmstrongAlbert EinsteinMarie CurieNiels BohrTheodore Roosevelt's model, where electrons orbit the nucleus
•  James ChadwickJames DaltonFrancis DrakeDmitri MendeleevAlexander FlemingCharles Darwin's model, where neutrons are also in the nucleus

Different  infraredalphaomegaultrasonicsubatomicmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10-120.5121, 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  saltsionsprotonsisotopesbondscompounds.