Model of the atom GapFill

All matter is made up of  atomscellschargesenergymoleculesions, which come in different types, called  reactantselementsparticlesatomsmetalsmolecules, represented using symbols which can be found on the  reactivity listcompound sequenceInternetperiodic tablegroup seriesatomic model. When these react together,  noble gasescompoundsmixturesbeta particlesprotonsatoms are formed, which have formulae to show the  ratiosizechargepositionimportancepercentage of each element.  MetalsPure substancesMixturesHalogensNeutronsElectrons contain multiple elements or compounds, and can be  bondedshapedmeltedfusedseparatedreacted using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakeplum puddingdoughnutupside-down pineapplestrawberry shortcakedough ball model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  elasticmagneticnucleardirectionalelectronicconnective model - based on the observations of  metallichalogenradiationbeta particlealpha particlegamma particle scattering
•  Marie CurieNeil ArmstrongAlbert EinsteinIsaac NewtonTheodore RooseveltNiels Bohr's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames DaltonAlexander FlemingJames ChadwickFrancis DrakeCharles Darwin's model, where neutrons are also in the nucleus

Different  omegaultrasonicalphasubatomicinfraredmagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -10.5121012, 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  compoundsprotonsbondsisotopesionssalts.