Model of the atom GapFill

All matter is made up of  energyatomsmoleculeschargescellsions, which come in different types, called  metalsmoleculeselementsatomsreactantsparticles, represented using symbols which can be found on the  reactivity listgroup seriescompound sequenceInternetperiodic tableatomic model. When these react together,  protonsatomscompoundsbeta particlesnoble gasesmixtures are formed, which have formulae to show the  chargeratiopositionpercentageimportancesize of each element.  ElectronsHalogensMixturesNeutronsMetalsPure substances contain multiple elements or compounds, and can be  shapedreactedseparatedmeltedfusedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakeplum puddingstrawberry shortcakeupside-down pineappledough balldoughnut model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicmagneticelasticdirectionalnuclearconnective model - based on the observations of  radiationhalogengamma particlealpha particlebeta particlemetallic scattering
•  Neil ArmstrongTheodore RooseveltAlbert EinsteinNiels BohrIsaac NewtonMarie Curie's model, where electrons orbit the nucleus
•  James ChadwickCharles DarwinJames DaltonAlexander FlemingDmitri MendeleevFrancis 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  0.5101122-1, 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  protonsisotopessaltsbondscompoundsions.