Model of the atom GapFill

All matter is made up of  energycellsionsatomschargesmolecules, which come in different types, called  moleculesparticlesatomselementsmetalsreactants, represented using symbols which can be found on the  periodic tablecompound sequencereactivity listgroup seriesatomic modelInternet. When these react together,  mixturesatomsbeta particlesnoble gasesprotonscompounds are formed, which have formulae to show the  ratiopercentageimportancechargesizeposition of each element.  NeutronsMixturesHalogensElectronsMetalsPure substances contain multiple elements or compounds, and can be  separatedmeltedshapedreactedfusedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutdough ballcheesecakeupside-down pineapplestrawberry shortcakeplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectivemagneticelectronicelasticnucleardirectional model - based on the observations of  radiationgamma particlehalogenbeta particlemetallicalpha particle scattering
•  Neil ArmstrongAlbert EinsteinIsaac NewtonMarie CurieNiels BohrTheodore Roosevelt's model, where electrons orbit the nucleus
•  Alexander FlemingJames ChadwickJames DaltonFrancis DrakeDmitri MendeleevCharles Darwin's model, where neutrons are also in the nucleus

Different  infraredultrasonicmagneticomegasubatomicalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.5212101-1, 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  bondssaltscompoundsionsisotopesprotons.