Model of the atom GapFill

All matter is made up of  energycellsmoleculeschargesionsatoms, which come in different types, called  particlesmetalsreactantsatomselementsmolecules, represented using symbols which can be found on the  reactivity listcompound sequenceatomic modelperiodic tablegroup seriesInternet. When these react together,  beta particlesmixturesatomsprotonscompoundsnoble gases are formed, which have formulae to show the  percentagepositionchargeimportanceratiosize of each element.  HalogensElectronsMetalsMixturesPure substancesNeutrons contain multiple elements or compounds, and can be  bondedseparatedmeltedshapedreactedfused using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakedough ballstrawberry shortcakeplum puddingdoughnutupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticnuclearconnectivedirectionalmagneticelectronic model - based on the observations of  radiationalpha particlehalogenmetallicbeta particlegamma particle scattering
•  Neil ArmstrongIsaac NewtonTheodore RooseveltNiels BohrAlbert EinsteinMarie Curie's model, where electrons orbit the nucleus
•  James ChadwickCharles DarwinFrancis DrakeDmitri MendeleevJames DaltonAlexander Fleming's model, where neutrons are also in the nucleus

Different  infraredultrasonicalphasubatomicmagneticomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  12-10.52101, 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  protonsionsbondssaltscompoundsisotopes.