Model of the atom GapFill

All matter is made up of  ionscellschargesenergyatomsmolecules, which come in different types, called  metalsreactantsmoleculesparticlesatomselements, represented using symbols which can be found on the  periodic tablereactivity listcompound sequenceatomic modelInternetgroup series. When these react together,  noble gasesmixturesatomscompoundsbeta particlesprotons are formed, which have formulae to show the  chargeimportancepercentagepositionratiosize of each element.  Pure substancesNeutronsMixturesElectronsMetalsHalogens contain multiple elements or compounds, and can be  shapedbondedreactedfusedmeltedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingcheesecakestrawberry shortcakedoughnutupside-down pineappledough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nucleardirectionalmagneticconnectiveelectronicelastic model - based on the observations of  gamma particlehalogenmetallicbeta particleradiationalpha particle scattering
•  Isaac NewtonNiels BohrAlbert EinsteinTheodore RooseveltMarie CurieNeil Armstrong's model, where electrons orbit the nucleus
•  Charles DarwinFrancis DrakeDmitri MendeleevAlexander FlemingJames ChadwickJames Dalton's model, where neutrons are also in the nucleus

Different  omegainfraredsubatomicalphaultrasonicmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  2101120.5-1, 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  saltsisotopesprotonsionscompoundsbonds.