Model of the atom GapFill

All matter is made up of cells energy ions atoms , which come in different types, called reactants particles elements atoms , represented using symbols which can be found on the compound sequence periodic table Internet group series . When these react together, beta particles compounds noble gases mixtures are formed, which have formulae to show the importance size percentage ratio of each element. Pure substances Mixtures Electrons Neutrons contain multiple elements or compounds, and can be melted separated bonded reacted using filtration, distillation, crystallisation and chromatography.

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

• the upside-down pineapple doughnut cheesecake plum pudding model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the electronic elastic nuclear magnetic model - based on the observations of radiation gamma particle beta particle alpha particle scattering
• Niels Bohr Neil Armstrong Isaac Newton Albert Einstein 's model, where electrons orbit the nucleus
• James Chadwick Charles Darwin James Dalton Francis Drake 's model, where neutrons are also in the nucleus

Different alpha subatomic magnetic infrared particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of 1 -1 10 12 , 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 compounds isotopes protons bonds .