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the separation of a dye into the different colours that make up that dye, as a result of the dyes travelling at different speeds through paper.
a group of elements that are non-reactive, monatomic gases (Group 0, 8 or 18).
a molecule that is so big that we can see it, e.g. diamond.
the introduction of halogen atoms into a compound by addition or substitution.
the mass of a formula unit relative to one atomic mass unit.