Model of the atom GapFill

All matter is made up of  chargesionsatomsenergycellsmolecules, which come in different types, called  reactantsmetalsatomselementsparticlesmolecules, represented using symbols which can be found on the  atomic modelInternetperiodic tablecompound sequencereactivity listgroup series. When these react together,  mixturesbeta particlescompoundsnoble gasesatomsprotons are formed, which have formulae to show the  importancepositionpercentageratiosizecharge of each element.  Pure substancesMetalsMixturesNeutronsElectronsHalogens contain multiple elements or compounds, and can be  separatedmeltedreactedfusedbondedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakedough ballstrawberry shortcakeupside-down pineappleplum puddingdoughnut model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  magneticelectronicdirectionalnuclearconnectiveelastic model - based on the observations of  halogenalpha particlegamma particlebeta particleradiationmetallic scattering
•  Marie CurieNiels BohrIsaac NewtonNeil ArmstrongTheodore RooseveltAlbert Einstein's model, where electrons orbit the nucleus
•  Alexander FlemingDmitri MendeleevCharles DarwinJames ChadwickJames DaltonFrancis Drake's model, where neutrons are also in the nucleus

Different  infraredultrasonicomegamagneticsubatomicalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-1101220.5, 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  ionsbondssaltsprotonsisotopescompounds.