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Model of the atom GapFill

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All matter is made up of , which come in different types, called , represented using symbols which can be found on the . When these react together, are formed, which have formulae to show the of each element. contain multiple elements or compounds, and can be using filtration, distillation, crystallisation and chromatography.

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

  • the model, where the atom is a ball of positive charge with electrons dotted around
  • Rutherford's model - the model - based on the observations of scattering
  • 's model, where electrons orbit the nucleus
  • 's model, where neutrons are also in the nucleus

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

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