Model of the atom GapFill

All matter is made up of  moleculesenergyionschargescellsatoms, which come in different types, called  metalsreactantsparticlesatomsmoleculeselements, represented using symbols which can be found on the  Internetgroup seriesreactivity listcompound sequenceatomic modelperiodic table. When these react together,  protonsmixturesbeta particlesatomscompoundsnoble gases are formed, which have formulae to show the  positionchargeratioimportancepercentagesize of each element.  MetalsElectronsPure substancesNeutronsMixturesHalogens contain multiple elements or compounds, and can be  separatedmeltedreactedshapedfusedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakeupside-down pineappleplum puddingcheesecakedoughnutdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicelasticdirectionalmagneticconnectivenuclear model - based on the observations of  alpha particlemetallicradiationbeta particlehalogengamma particle scattering
•  Niels BohrMarie CurieNeil ArmstrongTheodore RooseveltAlbert EinsteinIsaac Newton's model, where electrons orbit the nucleus
•  James DaltonFrancis DrakeCharles DarwinAlexander FlemingJames ChadwickDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  ultrasonicinfraredomegaalphamagneticsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  2-1120.5101, 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  protonscompoundsisotopessaltsionsbonds.