Model of the atom GapFill

All matter is made up of  ionscellsenergyatomschargesmolecules, which come in different types, called  atomsparticlesmetalsreactantsmoleculeselements, represented using symbols which can be found on the  periodic tableInternetcompound sequenceatomic modelreactivity listgroup series. When these react together,  compoundsbeta particlesnoble gasesmixturesatomsprotons are formed, which have formulae to show the  chargesizepercentageimportancepositionratio of each element.  HalogensMixturesMetalsNeutronsElectronsPure substances contain multiple elements or compounds, and can be  bondedfusedseparatedshapedmeltedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakedough balldoughnutupside-down pineappleplum puddingstrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectivemagneticelasticnuclearelectronicdirectional model - based on the observations of  halogenmetallicalpha particleradiationgamma particlebeta particle scattering
•  Neil ArmstrongMarie CurieTheodore RooseveltAlbert EinsteinIsaac NewtonNiels Bohr's model, where electrons orbit the nucleus
•  James ChadwickCharles DarwinJames DaltonFrancis DrakeDmitri MendeleevAlexander Fleming's model, where neutrons are also in the nucleus

Different  alphasubatomicultrasonicomegamagneticinfrared particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -11102120.5, 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  bondssaltscompoundsisotopesionsprotons.