Model of the atom GapFill

All matter is made up of  energyatomscellsions, which come in different types, called  reactantselementsparticlesatoms, represented using symbols which can be found on the  periodic tablecompound sequencereactivity listInternet. When these react together,  beta particlesmixturesatomscompounds are formed, which have formulae to show the  positionratioimportancepercentage of each element.  Pure substancesNeutronsMixturesElectrons contain multiple elements or compounds, and can be  reactedmeltedseparatedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  dough ballplum puddingdoughnutupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearconnectiveelectronicdirectional model - based on the observations of  gamma particlealpha particlebeta particlemetallic scattering
•  Marie CurieNeil ArmstrongIsaac NewtonNiels Bohr's model, where electrons orbit the nucleus
•  James ChadwickCharles DarwinDmitri MendeleevJames Dalton's model, where neutrons are also in the nucleus

Different  alphasubatomicinfraredmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -110121, 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.