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...Revision guide atomic structure and the periodic table atoms elementsandcompounds compounds all substances are made of an atom is some elements combine through chemical smallest part element that can exist reactions to form each represented by a from two or more symbol egorepresents oxygen na different types combined represents sodium together in fixed proportions be formulae using symbols which they were formed e g co anelement substance with only one type listed there about compoundshavedifferent propertiesfrom classified as metal non depending canonly separated into on their properties columns called groups contain similar rows periods show gradual change across period mixtures separating techniques mixture consists not physical processes chemically such filtration crystallisation simple distillation fractional chromatography these unchanged do involve thermometer evaporation evaporating basin leibig condenser water out round bottomed heat flask soluble solid aliquid salt separate t...