Model of the atom GapFill

All matter is made up of  moleculescellschargesionsatomsenergy, which come in different types, called  atomsparticlesmoleculeselementsreactantsmetals, represented using symbols which can be found on the  Internetperiodic tablereactivity listatomic modelgroup seriescompound sequence. When these react together,  noble gasesatomscompoundsprotonsmixturesbeta particles are formed, which have formulae to show the  percentagesizechargepositionimportanceratio of each element.  Pure substancesHalogensNeutronsMixturesElectronsMetals contain multiple elements or compounds, and can be  reactedshapedbondedmeltedfusedseparated using filtration, distillation, crystallisation and chromatography.

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

• the  upside-down pineapplestrawberry shortcakedoughnutdough ballcheesecakeplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicconnectivenuclearmagneticelasticdirectional model - based on the observations of  metallichalogenbeta particleradiationalpha particlegamma particle scattering
•  Neil ArmstrongTheodore RooseveltMarie CurieIsaac NewtonAlbert EinsteinNiels Bohr's model, where electrons orbit the nucleus
•  Francis DrakeJames ChadwickDmitri MendeleevCharles DarwinAlexander FlemingJames Dalton's model, where neutrons are also in the nucleus

Different  magneticsubatomicinfraredomegaultrasonicalpha particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  0.5122-1101, 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  compoundsisotopesionsprotonsbondssalts.