Model of the atom GapFill

All matter is made up of  moleculesatomscellsionschargesenergy, which come in different types, called  reactantsmetalsatomsparticleselementsmolecules, represented using symbols which can be found on the  atomic modelperiodic tablegroup seriesreactivity listcompound sequenceInternet. When these react together,  protonsmixturesnoble gasesatomscompoundsbeta particles are formed, which have formulae to show the  importancepositionsizepercentageratiocharge of each element.  MixturesMetalsNeutronsElectronsHalogensPure substances contain multiple elements or compounds, and can be  shapedreactedbondedfusedseparatedmelted using filtration, distillation, crystallisation and chromatography.

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

• the  upside-down pineapplestrawberry shortcakecheesecakeplum puddingdoughnutdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  magneticdirectionalconnectivenuclearelasticelectronic model - based on the observations of  beta particlealpha particlehalogenmetallicradiationgamma particle scattering
•  Albert EinsteinTheodore RooseveltNiels BohrMarie CurieNeil ArmstrongIsaac Newton's model, where electrons orbit the nucleus
•  Charles DarwinAlexander FlemingJames DaltonFrancis DrakeJames ChadwickDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  alphaultrasonicmagneticsubatomicinfraredomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1210-10.521, 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  bondscompoundsionssaltsprotonsisotopes.