Model of the atom GapFill

All matter is made up of  atomschargesmoleculescellsionsenergy, which come in different types, called  elementsparticlesmetalsmoleculesatomsreactants, represented using symbols which can be found on the  group seriesreactivity listInternetperiodic tablecompound sequenceatomic model. When these react together,  compoundsmixturesatomsnoble gasesprotonsbeta particles are formed, which have formulae to show the  ratiopositionimportancesizepercentagecharge of each element.  Pure substancesNeutronsMetalsHalogensMixturesElectrons contain multiple elements or compounds, and can be  reactedshapedmeltedfusedseparatedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutupside-down pineapplestrawberry shortcakecheesecakeplum puddingdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicmagneticconnectivenucleardirectionalelastic model - based on the observations of  metallichalogenradiationbeta particlegamma particlealpha particle scattering
•  Isaac NewtonNiels BohrTheodore RooseveltNeil ArmstrongMarie CurieAlbert Einstein's model, where electrons orbit the nucleus
•  Charles DarwinFrancis DrakeDmitri MendeleevJames ChadwickAlexander FlemingJames Dalton's model, where neutrons are also in the nucleus

Different  omegainfraredmagneticalphasubatomicultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1210-10.521, 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  ionsbondsprotonsisotopessaltscompounds.