Model of the atom GapFill

All matter is made up of  moleculesatomscellschargesionsenergy, which come in different types, called  moleculesmetalsatomsreactantsparticleselements, represented using symbols which can be found on the  Internetreactivity listgroup seriesperiodic tableatomic modelcompound sequence. When these react together,  protonscompoundsbeta particlesmixturesatomsnoble gases are formed, which have formulae to show the  chargesizeimportanceratiopercentageposition of each element.  ElectronsMetalsNeutronsMixturesPure substancesHalogens contain multiple elements or compounds, and can be  reactedmeltedfusedbondedshapedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  upside-down pineappledoughnutstrawberry shortcakecheesecakedough ballplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearelectronicmagneticelasticconnectivedirectional model - based on the observations of  gamma particlealpha particlemetallichalogenbeta particleradiation scattering
•  Isaac NewtonNeil ArmstrongAlbert EinsteinMarie CurieNiels BohrTheodore Roosevelt's model, where electrons orbit the nucleus
•  Alexander FlemingCharles DarwinJames DaltonDmitri MendeleevJames ChadwickFrancis Drake's model, where neutrons are also in the nucleus

Different  omegaalphamagneticultrasonicinfraredsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  212-10.5101, 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  ionsisotopesprotonscompoundssaltsbonds.