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...Year chemistry unit class name atomic structure l elements mixtures and compounds atoms molecules remember that an element is one type of atom like carbon gold or chlorine we will look at three ways can exist single the some do not join up with other they stay as helium this each any it a gas when sameelement together get molecule compound made ofdifferent elementsjoin by chemical bonds means always separate diagrams show common what mixture amixture from different substances are chemically joined in summary test yourself task write correct letters below challenge which letter showing gases solid could be water h o...