Model of the atom GapFill

All matter is made up of  ionsmoleculesenergycellschargesatoms, which come in different types, called  particleselementsatomsreactantsmetalsmolecules, represented using symbols which can be found on the  periodic tablecompound sequencereactivity listInternetgroup seriesatomic model. When these react together,  atomsbeta particlesmixturescompoundsprotonsnoble gases are formed, which have formulae to show the  chargepercentageratioimportancesizeposition of each element.  ElectronsPure substancesMixturesNeutronsHalogensMetals contain multiple elements or compounds, and can be  shapedfusedmeltedseparatedbondedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  dough ballcheesecakeplum puddingdoughnutstrawberry shortcakeupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  directionalelasticelectronicconnectivemagneticnuclear model - based on the observations of  metallicalpha particlebeta particlegamma particlehalogenradiation scattering
•  Marie CurieNiels BohrTheodore RooseveltNeil ArmstrongIsaac NewtonAlbert Einstein's model, where electrons orbit the nucleus
•  James DaltonCharles DarwinJames ChadwickDmitri MendeleevAlexander FlemingFrancis Drake's model, where neutrons are also in the nucleus

Different  subatomicultrasonicomegaalphainfraredmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10-10.51212, 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  isotopesbondsionsprotonscompoundssalts.