Model of the atom GapFill

All matter is made up of  moleculesatomscellsenergyionscharges, which come in different types, called  elementsatomsreactantsmoleculesmetalsparticles, represented using symbols which can be found on the  periodic tablegroup seriesInternetreactivity listcompound sequenceatomic model. When these react together,  beta particlesnoble gasescompoundsatomsprotonsmixtures are formed, which have formulae to show the  positionsizeimportanceratiochargepercentage of each element.  MixturesElectronsPure substancesHalogensMetalsNeutrons contain multiple elements or compounds, and can be  reactedbondedfusedmeltedshapedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  dough ballstrawberry shortcakecheesecakeupside-down pineappleplum puddingdoughnut model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectiveelectronicdirectionalnuclearmagneticelastic model - based on the observations of  alpha particlegamma particlebeta particlemetallicradiationhalogen scattering
•  Albert EinsteinMarie CurieIsaac NewtonNeil ArmstrongNiels BohrTheodore Roosevelt's model, where electrons orbit the nucleus
•  Dmitri MendeleevFrancis DrakeJames DaltonCharles DarwinJames ChadwickAlexander Fleming's model, where neutrons are also in the nucleus

Different  subatomicalphaultrasonicinfraredomegamagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  21012-110.5, 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  bondsprotonssaltscompoundsionsisotopes.