Model of the atom GapFill

All matter is made up of  energyionscellsatoms, which come in different types, called  atomselementsreactantsparticles, represented using symbols which can be found on the  compound sequencereactivity listInternetperiodic table. When these react together,  mixturesatomscompoundsbeta particles are formed, which have formulae to show the  ratiopercentageimportanceposition of each element.  ElectronsPure substancesNeutronsMixtures contain multiple elements or compounds, and can be  separatedshapedmeltedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingdoughnutdough ballupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nucleardirectionalelectronicconnective model - based on the observations of  metallicalpha particlebeta particlegamma particle scattering
•  Isaac NewtonMarie CurieNiels BohrNeil Armstrong's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames DaltonJames ChadwickCharles Darwin's model, where neutrons are also in the nucleus

Different  magneticinfraredalphasubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  12101-1, 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  bondsprotonssaltsisotopes.