Model of the atom GapFill

All matter is made up of  cellsmoleculesenergyatomsionscharges, which come in different types, called  elementsatomsreactantsparticlesmoleculesmetals, represented using symbols which can be found on the  reactivity listcompound sequencegroup seriesatomic modelInternetperiodic table. When these react together,  atomsnoble gasescompoundsmixturesprotonsbeta particles are formed, which have formulae to show the  positionsizechargeimportanceratiopercentage of each element.  ElectronsMetalsMixturesNeutronsPure substancesHalogens contain multiple elements or compounds, and can be  meltedreactedseparatedfusedshapedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakecheesecakedough ballplum puddingdoughnutupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectivemagneticelasticnuclearelectronicdirectional model - based on the observations of  radiationmetallichalogengamma particlebeta particlealpha particle scattering
•  Isaac NewtonNeil ArmstrongMarie CurieNiels BohrAlbert EinsteinTheodore Roosevelt's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames DaltonAlexander FlemingJames ChadwickCharles DarwinFrancis Drake's model, where neutrons are also in the nucleus

Different  subatomicultrasonicmagneticinfraredalphaomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  2121-1100.5, 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  bondssaltscompoundsionsisotopesprotons.