Model of the atom GapFill

All matter is made up of  energycellsatomschargesmoleculesions, which come in different types, called  metalsreactantsmoleculesparticlesatomselements, represented using symbols which can be found on the  compound sequenceperiodic tableatomic modelInternetreactivity listgroup series. When these react together,  compoundsmixturesprotonsatomsnoble gasesbeta particles are formed, which have formulae to show the  percentagechargeratiosizeimportanceposition of each element.  MixturesNeutronsMetalsElectronsPure substancesHalogens contain multiple elements or compounds, and can be  reactedbondedmeltedseparatedfusedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutdough ballstrawberry shortcakeupside-down pineapplecheesecakeplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  magneticdirectionalconnectivenuclearelectronicelastic model - based on the observations of  halogenbeta particleradiationmetallicgamma particlealpha particle scattering
•  Albert EinsteinNeil ArmstrongNiels BohrMarie CurieIsaac NewtonTheodore Roosevelt's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames ChadwickCharles DarwinFrancis DrakeAlexander FlemingJames Dalton's model, where neutrons are also in the nucleus

Different  subatomicinfraredalphaultrasonicmagneticomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-112100.52, 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.