Model of the atom GapFill

All matter is made up of  moleculesionschargesenergyatomscells, which come in different types, called  metalsreactantsmoleculeselementsatomsparticles, represented using symbols which can be found on the  compound sequencegroup seriesreactivity listperiodic tableInternetatomic model. When these react together,  compoundsnoble gasesbeta particlesmixturesatomsprotons are formed, which have formulae to show the  positionsizechargepercentageimportanceratio of each element.  HalogensPure substancesMixturesNeutronsElectronsMetals contain multiple elements or compounds, and can be  meltedseparatedbondedfusedreactedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutplum puddingstrawberry shortcakecheesecakedough ballupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearmagneticconnectivedirectionalelasticelectronic model - based on the observations of  gamma particlemetallichalogenradiationalpha particlebeta particle scattering
•  Neil ArmstrongIsaac NewtonMarie CurieAlbert EinsteinTheodore RooseveltNiels Bohr's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames ChadwickJames DaltonFrancis DrakeCharles DarwinAlexander Fleming'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  110-11220.5, 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  protonsbondscompoundssaltsisotopesions.