Model of the atom GapFill

All matter is made up of  energymoleculescellschargesionsatoms, which come in different types, called  elementsatomsmoleculesreactantsmetalsparticles, represented using symbols which can be found on the  group seriesatomic modelcompound sequenceperiodic tableInternetreactivity list. When these react together,  noble gasescompoundsprotonsatomsmixturesbeta particles are formed, which have formulae to show the  positionpercentagesizechargeimportanceratio of each element.  HalogensMixturesPure substancesElectronsMetalsNeutrons contain multiple elements or compounds, and can be  shapedseparatedmeltedfusedreactedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingcheesecakeupside-down pineapplestrawberry shortcakedoughnutdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicconnectivemagneticdirectionalelasticnuclear model - based on the observations of  radiationgamma particlebeta particlealpha particlehalogenmetallic scattering
•  Albert EinsteinIsaac NewtonTheodore RooseveltMarie CurieNiels BohrNeil Armstrong's model, where electrons orbit the nucleus
•  Charles DarwinAlexander FlemingDmitri MendeleevJames ChadwickJames DaltonFrancis Drake's model, where neutrons are also in the nucleus

Different  ultrasonicmagneticinfraredalphasubatomicomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  2101210.5-1, 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  ionscompoundssaltsisotopesbondsprotons.