Model of the atom GapFill

All matter is made up of  energymoleculeschargescellsionsatoms, which come in different types, called  particlesmoleculesmetalsatomselementsreactants, represented using symbols which can be found on the  compound sequencereactivity listperiodic tableInternetatomic modelgroup series. When these react together,  protonscompoundsbeta particlesatomsmixturesnoble gases are formed, which have formulae to show the  positionratiosizepercentageimportancecharge of each element.  Pure substancesHalogensMetalsElectronsNeutronsMixtures contain multiple elements or compounds, and can be  separatedfusedbondedreactedshapedmelted using filtration, distillation, crystallisation and chromatography.

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

• the  cheesecakeplum puddingupside-down pineappledough balldoughnutstrawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  electronicelasticconnectivenuclearmagneticdirectional model - based on the observations of  radiationalpha particlegamma particlehalogenmetallicbeta particle scattering
•  Theodore RooseveltNiels BohrNeil ArmstrongMarie CurieIsaac NewtonAlbert Einstein's model, where electrons orbit the nucleus
•  James ChadwickCharles DarwinFrancis DrakeJames DaltonAlexander FlemingDmitri Mendeleev's model, where neutrons are also in the nucleus

Different  magneticomegaalphaultrasonicinfraredsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  12-1210.510, 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  isotopesbondscompoundsprotonssaltsions.