Model of the atom GapFill

All matter is made up of  cellsmoleculesenergyionschargesatoms, which come in different types, called  elementsparticlesmoleculesreactantsmetalsatoms, represented using symbols which can be found on the  periodic tablereactivity listatomic modelInternetcompound sequencegroup series. When these react together,  mixturesbeta particlescompoundsatomsprotonsnoble gases are formed, which have formulae to show the  sizepositionratioimportancechargepercentage of each element.  NeutronsMetalsHalogensMixturesPure substancesElectrons contain multiple elements or compounds, and can be  separatedbondedmeltedreactedshapedfused using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingstrawberry shortcakeupside-down pineapplecheesecakedoughnutdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticmagneticdirectionalelectronicnuclearconnective model - based on the observations of  gamma particlealpha particlebeta particlemetallicradiationhalogen scattering
•  Theodore RooseveltNeil ArmstrongMarie CurieNiels BohrIsaac NewtonAlbert Einstein's model, where electrons orbit the nucleus
•  Francis DrakeJames ChadwickAlexander FlemingCharles DarwinJames DaltonDmitri Mendeleev's model, where neutrons are also in the nucleus

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