Model of the atom GapFill

All matter is made up of  moleculesionsatomsenergychargescells, which come in different types, called  reactantsatomsparticlesmetalselementsmolecules, represented using symbols which can be found on the  reactivity listgroup seriescompound sequenceatomic modelperiodic tableInternet. When these react together,  noble gasesbeta particlescompoundsprotonsmixturesatoms are formed, which have formulae to show the  positionimportancechargeratiosizepercentage of each element.  MetalsHalogensElectronsPure substancesMixturesNeutrons contain multiple elements or compounds, and can be  shapedmeltedfusedbondedreactedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutstrawberry shortcakeupside-down pineappledough ballplum puddingcheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicnuclearconnectivemagneticdirectionalelastic model - based on the observations of  alpha particlebeta particleradiationhalogengamma particlemetallic scattering
•  Theodore RooseveltNeil ArmstrongMarie CurieAlbert EinsteinIsaac NewtonNiels Bohr's model, where electrons orbit the nucleus
•  Alexander FlemingJames DaltonJames ChadwickDmitri MendeleevCharles DarwinFrancis Drake's model, where neutrons are also in the nucleus

Different  ultrasonicsubatomicinfraredomegaalphamagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -1212100.51, 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  isotopescompoundsprotonssaltsionsbonds.