Model of the atom GapFill

All matter is made up of  atomsionsenergycells, which come in different types, called  particleselementsatomsreactants, represented using symbols which can be found on the  reactivity listperiodic tableInternetcompound sequence. When these react together,  beta particlescompoundsatomsmixtures are formed, which have formulae to show the  percentagepositionimportanceratio of each element.  ElectronsPure substancesNeutronsMixtures contain multiple elements or compounds, and can be  shapedseparatedmeltedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutupside-down pineappleplum puddingdough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicdirectionalconnectivenuclear model - based on the observations of  alpha particlegamma particlebeta particlemetallic scattering
•  Marie CurieNeil ArmstrongIsaac NewtonNiels Bohr's model, where electrons orbit the nucleus
•  Charles DarwinJames DaltonDmitri MendeleevJames Chadwick's model, where neutrons are also in the nucleus

Different  infraredmagneticsubatomicalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-11012, 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  protonsisotopessaltsbonds.