Model of the atom GapFill

All matter is made up of  atomsionscellsenergy, which come in different types, called  particlesatomselementsreactants, represented using symbols which can be found on the  Internetcompound sequencereactivity listperiodic table. When these react together,  atomsmixturesbeta particlescompounds are formed, which have formulae to show the  percentageratioimportanceposition of each element.  Pure substancesElectronsMixturesNeutrons contain multiple elements or compounds, and can be  reactedseparatedmeltedshaped using filtration, distillation, crystallisation and chromatography.

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

• the  dough balldoughnutplum puddingupside-down pineapple model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the  connectiveelectronicnucleardirectional model - based on the observations of  metallicbeta particlegamma particlealpha particle scattering
•  Neil ArmstrongNiels BohrIsaac NewtonMarie Curie's model, where electrons orbit the nucleus
•  Dmitri MendeleevJames DaltonCharles DarwinJames Chadwick's model, where neutrons are also in the nucleus

Different  infraredsubatomicalphamagnetic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -110112, 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  bondssaltsisotopesprotons.