Model of the atom GapFill

All matter is made up of  energyatomsionscells, which come in different types, called  atomsparticlesreactantselements, represented using symbols which can be found on the  periodic tableInternetreactivity listcompound sequence. When these react together,  beta particlesmixturesatomscompounds are formed, which have formulae to show the  importanceratiopercentageposition of each element.  MixturesNeutronsElectronsPure substances contain multiple elements or compounds, and can be  separatedmeltedreactedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  upside-down pineappledoughnutdough ballplum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  nuclearconnectivedirectionalelectronic model - based on the observations of  beta particlealpha particlegamma particlemetallic scattering
•  Isaac NewtonNeil ArmstrongNiels BohrMarie Curie's model, where electrons orbit the nucleus
•  Charles DarwinDmitri MendeleevJames ChadwickJames Dalton's model, where neutrons are also in the nucleus

Different  infraredalphamagneticsubatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  10-1121, 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  protonssaltsisotopesbonds.