Model of the atom GapFill

All matter is made up of  cellsionsenergyatoms, which come in different types, called  reactantselementsparticlesatoms, represented using symbols which can be found on the  reactivity listperiodic tablecompound sequenceInternet. When these react together,  atomsbeta particlesmixturescompounds are formed, which have formulae to show the  importanceratiopercentageposition of each element.  NeutronsMixturesElectronsPure substances contain multiple elements or compounds, and can be  shapedmeltedseparatedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingdough ballupside-down pineappledoughnut model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicdirectionalnuclearconnective model - based on the observations of  beta particlealpha particlemetallicgamma particle scattering
•  Niels BohrNeil ArmstrongIsaac NewtonMarie Curie's model, where electrons orbit the nucleus
•  James ChadwickJames DaltonDmitri MendeleevCharles Darwin's model, where neutrons are also in the nucleus

Different  infraredmagneticalphasubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -112110, 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  protonsbondsisotopessalts.