Model of the atom GapFill

All matter is made up of  chargesmoleculescellsionsenergyatoms, which come in different types, called  metalsreactantselementsmoleculesatomsparticles, represented using symbols which can be found on the  group seriesreactivity listperiodic tableatomic modelInternetcompound sequence. When these react together,  noble gasesprotonsatomscompoundsbeta particlesmixtures are formed, which have formulae to show the  sizepositionimportancepercentageratiocharge of each element.  NeutronsMixturesPure substancesMetalsHalogensElectrons contain multiple elements or compounds, and can be  bondedreactedseparatedfusedshapedmelted using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakeupside-down pineapplecheesecakeplum puddingdough balldoughnut model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearmagneticelectronicconnectivedirectionalelastic model - based on the observations of  gamma particlemetallicbeta particlealpha particlehalogenradiation scattering
•  Albert EinsteinNeil ArmstrongTheodore RooseveltNiels BohrIsaac NewtonMarie Curie's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames DaltonFrancis DrakeJames ChadwickAlexander FlemingCharles Darwin's model, where neutrons are also in the nucleus

Different  infraredalphaultrasonicsubatomicmagneticomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-1120.5210, 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  compoundsprotonsionsisotopesbondssalts.