Model of the atom GapFill

All matter is made up of  chargesatomscellsenergymoleculesions, which come in different types, called  atomsmoleculesmetalsreactantsparticleselements, represented using symbols which can be found on the  group seriesreactivity listInternetcompound sequenceatomic modelperiodic table. When these react together,  noble gasesbeta particlesprotonsatomscompoundsmixtures are formed, which have formulae to show the  chargeimportancepercentagepositionratiosize of each element.  HalogensMetalsNeutronsElectronsMixturesPure substances contain multiple elements or compounds, and can be  shapedseparatedbondedfusedmeltedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingdough balldoughnutcheesecakestrawberry shortcakeupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticelectronicnucleardirectionalconnectivemagnetic model - based on the observations of  radiationgamma particlehalogenbeta particlemetallicalpha particle scattering
•  Isaac NewtonNiels BohrTheodore RooseveltMarie CurieNeil ArmstrongAlbert Einstein's model, where electrons orbit the nucleus
•  James DaltonAlexander FlemingCharles DarwinFrancis DrakeJames ChadwickDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  subatomicomegaalphamagneticinfraredultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.512110-12, 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  bondsprotonsisotopesionssaltscompounds.