Model of the atom GapFill

All matter is made up of  atomsionschargesenergycellsmolecules, which come in different types, called  reactantsmoleculeselementsparticlesmetalsatoms, represented using symbols which can be found on the  Internetperiodic tablegroup seriesreactivity listatomic modelcompound sequence. When these react together,  beta particlesatomsmixturescompoundsnoble gasesprotons are formed, which have formulae to show the  sizeratiochargepositionpercentageimportance of each element.  ElectronsMetalsNeutronsHalogensPure substancesMixtures contain multiple elements or compounds, and can be  meltedshapedreactedseparatedfusedbonded using filtration, distillation, crystallisation and chromatography.

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

• the  strawberry shortcakeupside-down pineappledoughnutdough ballcheesecakeplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicdirectionalnuclearelasticmagneticconnective model - based on the observations of  alpha particleradiationbeta particlegamma particlemetallichalogen scattering
•  Theodore RooseveltAlbert EinsteinIsaac NewtonNiels BohrNeil ArmstrongMarie Curie's model, where electrons orbit the nucleus
•  Francis DrakeJames DaltonJames ChadwickCharles DarwinDmitri MendeleevAlexander Fleming's model, where neutrons are also in the nucleus

Different  subatomicmagneticinfraredalphaultrasonicomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -1100.52112, 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  compoundssaltsionsprotonsisotopesbonds.