Model of the atom GapFill

All matter is made up of  energyionschargescellsmoleculesatoms, which come in different types, called  reactantsparticlesmetalselementsatomsmolecules, represented using symbols which can be found on the  atomic modelInternetreactivity listgroup seriesperiodic tablecompound sequence. When these react together,  compoundsnoble gasesmixturesbeta particlesprotonsatoms are formed, which have formulae to show the  ratiosizepositionimportancepercentagecharge of each element.  MixturesPure substancesElectronsNeutronsHalogensMetals contain multiple elements or compounds, and can be  fusedseparatedbondedreactedshapedmelted using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutstrawberry shortcakeplum puddingdough ballupside-down pineapplecheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  magneticelasticelectronicdirectionalconnectivenuclear model - based on the observations of  beta particlehalogenalpha particlegamma particleradiationmetallic scattering
•  Niels BohrNeil ArmstrongAlbert EinsteinTheodore RooseveltMarie CurieIsaac Newton's model, where electrons orbit the nucleus
•  Francis DrakeDmitri MendeleevJames DaltonCharles DarwinAlexander FlemingJames Chadwick's model, where neutrons are also in the nucleus

Different  subatomicmagneticultrasonicinfraredalphaomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  2120.51-110, 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  bondscompoundsionssaltsisotopesprotons.