Model of the atom GapFill

All matter is made up of  ionsatomscellschargesenergymolecules, which come in different types, called  elementsparticlesmetalsatomsreactantsmolecules, represented using symbols which can be found on the  group seriesreactivity listcompound sequenceperiodic tableInternetatomic model. When these react together,  atomsnoble gasesmixturescompoundsbeta particlesprotons are formed, which have formulae to show the  importancesizepercentageratiopositioncharge of each element.  MixturesMetalsHalogensNeutronsPure substancesElectrons contain multiple elements or compounds, and can be  bondedshapedseparatedmeltedfusedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutstrawberry shortcakedough ballupside-down pineappleplum puddingcheesecake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  directionalelasticconnectivemagneticnuclearelectronic model - based on the observations of  gamma particlebeta particlehalogenmetallicradiationalpha particle scattering
•  Neil ArmstrongNiels BohrTheodore RooseveltMarie CurieIsaac NewtonAlbert Einstein's model, where electrons orbit the nucleus
•  James DaltonCharles DarwinFrancis DrakeAlexander FlemingJames ChadwickDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  ultrasonicomegaalphamagneticinfraredsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1-110120.52, 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  saltsionsbondscompoundsisotopesprotons.