Model of the atom GapFill

All matter is made up of  atomsionsenergychargescellsmolecules, which come in different types, called  reactantsparticleselementsmoleculesatomsmetals, represented using symbols which can be found on the  atomic modelgroup seriescompound sequenceperiodic tablereactivity listInternet. When these react together,  compoundsmixturesnoble gasesprotonsatomsbeta particles are formed, which have formulae to show the  importanceratiopercentagechargesizeposition of each element.  MetalsMixturesHalogensPure substancesNeutronsElectrons contain multiple elements or compounds, and can be  reactedfusedshapedbondedmeltedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakedough ballupside-down pineappleplum puddingdoughnutcheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicnuclearconnectiveelasticdirectionalmagnetic model - based on the observations of  alpha particlehalogengamma particlemetallicradiationbeta particle scattering
•  Niels BohrAlbert EinsteinIsaac NewtonTheodore RooseveltMarie CurieNeil Armstrong's model, where electrons orbit the nucleus
•  James ChadwickAlexander FlemingDmitri MendeleevJames DaltonCharles DarwinFrancis Drake's model, where neutrons are also in the nucleus

Different  omegamagneticinfraredsubatomicalphaultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -1120.51210, 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  compoundssaltsionsisotopesprotonsbonds.