Model of the atom GapFill

All matter is made up of  ionsenergychargesmoleculesatomscells, which come in different types, called  moleculesreactantsmetalsparticleselementsatoms, represented using symbols which can be found on the  Internetreactivity listatomic modelperiodic tablegroup seriescompound sequence. When these react together,  beta particlesnoble gasesprotonsmixturesatomscompounds are formed, which have formulae to show the  chargepercentagepositionratioimportancesize of each element.  HalogensMixturesPure substancesNeutronsMetalsElectrons contain multiple elements or compounds, and can be  reactedbondedseparatedshapedmeltedfused using filtration, distillation, crystallisation and chromatography.

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

• the  doughnutupside-down pineappleplum puddingcheesecakedough ballstrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicelasticnuclearconnectivedirectionalmagnetic model - based on the observations of  radiationhalogengamma particlebeta particlealpha particlemetallic scattering
•  Isaac NewtonTheodore RooseveltNiels BohrMarie CurieAlbert EinsteinNeil Armstrong's model, where electrons orbit the nucleus
•  Francis DrakeCharles DarwinJames DaltonAlexander FlemingJames ChadwickDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  alphasubatomicinfraredultrasonicmagneticomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1210.5-1210, 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  isotopesbondssaltsprotonsionscompounds.