Model of the atom GapFill

All matter is made up of  cellsatomsenergychargesionsmolecules, which come in different types, called  particlesreactantsmoleculesmetalsatomselements, represented using symbols which can be found on the  periodic tablegroup seriesatomic modelreactivity listInternetcompound sequence. When these react together,  mixturesprotonscompoundsatomsbeta particlesnoble gases are formed, which have formulae to show the  sizepercentageratiochargeimportanceposition of each element.  NeutronsElectronsMetalsHalogensPure substancesMixtures contain multiple elements or compounds, and can be  meltedreactedshapedbondedfusedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutplum puddingupside-down pineapplecheesecakedough ballstrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicconnectiveelasticmagneticnucleardirectional model - based on the observations of  beta particlemetallicgamma particleradiationhalogenalpha particle scattering
•  Theodore RooseveltAlbert EinsteinMarie CurieNeil ArmstrongIsaac NewtonNiels Bohr's model, where electrons orbit the nucleus
•  James ChadwickFrancis DrakeDmitri MendeleevJames DaltonAlexander FlemingCharles Darwin's model, where neutrons are also in the nucleus

Different  ultrasonicsubatomicmagneticalphaomegainfrared particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -1120.51102, 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  protonsionssaltscompoundsbondsisotopes.