Model of the atom GapFill

All matter is made up of  moleculeschargescellsatomsionsenergy, which come in different types, called  particlesmoleculesreactantsatomselementsmetals, represented using symbols which can be found on the  periodic tablegroup seriesInternetatomic modelcompound sequencereactivity list. When these react together,  compoundsatomsmixturesprotonsbeta particlesnoble gases are formed, which have formulae to show the  importancepercentagesizechargeratioposition of each element.  HalogensElectronsMetalsMixturesNeutronsPure substances contain multiple elements or compounds, and can be  separatedmeltedbondedfusedshapedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  upside-down pineappledoughnutstrawberry shortcakedough ballcheesecakeplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearelectronicelasticmagneticconnectivedirectional model - based on the observations of  gamma particlehalogenalpha particlemetallicbeta particleradiation scattering
•  Isaac NewtonNeil ArmstrongMarie CurieTheodore RooseveltNiels BohrAlbert Einstein's model, where electrons orbit the nucleus
•  James ChadwickJames DaltonFrancis DrakeCharles DarwinDmitri MendeleevAlexander Fleming's model, where neutrons are also in the nucleus

Different  subatomicultrasonicomegaalphamagneticinfrared particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-12120.510, 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  isotopescompoundssaltsprotonsionsbonds.