Model of the atom GapFill

All matter is made up of  cellsatomsenergychargesionsmolecules, which come in different types, called  elementsmoleculesparticlesmetalsatomsreactants, represented using symbols which can be found on the  reactivity listatomic modelperiodic tablegroup seriescompound sequenceInternet. When these react together,  mixturesbeta particlescompoundsatomsnoble gasesprotons are formed, which have formulae to show the  positionpercentageimportanceratiochargesize of each element.  MetalsElectronsHalogensPure substancesMixturesNeutrons contain multiple elements or compounds, and can be  reactedfusedmeltedshapedbondedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutdough ballstrawberry shortcakeupside-down pineappleplum puddingcheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticdirectionalconnectiveelectronicnuclearmagnetic model - based on the observations of  radiationmetallicalpha particlegamma particlebeta particlehalogen scattering
•  Niels BohrIsaac NewtonNeil ArmstrongTheodore RooseveltMarie CurieAlbert Einstein's model, where electrons orbit the nucleus
•  James ChadwickJames DaltonDmitri MendeleevFrancis DrakeCharles DarwinAlexander Fleming's model, where neutrons are also in the nucleus

Different  subatomicinfraredalphaultrasonicomegamagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10120.5-112, 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  saltscompoundsisotopesprotonsbondsions.