Model of the atom GapFill

All matter is made up of  moleculesionschargesenergycellsatoms, which come in different types, called  particlesmetalsmoleculesatomsreactantselements, represented using symbols which can be found on the  atomic modelgroup seriesreactivity listperiodic tablecompound sequenceInternet. When these react together,  atomsbeta particlescompoundsnoble gasesprotonsmixtures are formed, which have formulae to show the  chargeimportancepercentageratiosizeposition of each element.  MetalsElectronsPure substancesMixturesNeutronsHalogens contain multiple elements or compounds, and can be  reactedmeltedfusedseparatedshapedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  plum puddingdoughnutcheesecakeupside-down pineapplestrawberry shortcakedough ball 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  halogenalpha particlegamma particleradiationbeta particlemetallic scattering
•  Theodore RooseveltNiels BohrIsaac NewtonNeil ArmstrongMarie CurieAlbert Einstein's model, where electrons orbit the nucleus
•  Charles DarwinAlexander FlemingJames DaltonDmitri MendeleevJames ChadwickFrancis Drake's model, where neutrons are also in the nucleus

Different  infraredomegasubatomicultrasonicmagneticalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.5-1110122, 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  ionssaltscompoundsisotopesprotonsbonds.