Model of the atom GapFill

All matter is made up of  cellsmoleculesionsenergyatomscharges, which come in different types, called  particlesatomsmoleculesreactantselementsmetals, represented using symbols which can be found on the  periodic tablegroup seriescompound sequenceInternetreactivity listatomic model. When these react together,  protonscompoundsnoble gasesatomsbeta particlesmixtures are formed, which have formulae to show the  positionchargepercentageratioimportancesize of each element.  MixturesNeutronsElectronsPure substancesMetalsHalogens contain multiple elements or compounds, and can be  fusedbondedshapedseparatedreactedmelted using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingupside-down pineappledoughnutdough ballcheesecakestrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicconnectivemagneticnucleardirectionalelastic model - based on the observations of  gamma particlehalogenmetallicbeta particlealpha particleradiation scattering
•  Niels BohrNeil ArmstrongAlbert EinsteinIsaac NewtonTheodore RooseveltMarie Curie's model, where electrons orbit the nucleus
•  Alexander FlemingJames ChadwickCharles DarwinJames DaltonDmitri MendeleevFrancis Drake's model, where neutrons are also in the nucleus

Different  subatomicinfraredalphaomegaultrasonicmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.5-1110122, 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  isotopesionsbondscompoundsprotonssalts.