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everything around, and excluding, the chemical system itself.
the arrangement of electrons in the different orbitals in an atom.
a molecule that is so big that we can see it, e.g. a diamond, a salt crystal and a piece of...
the process whereby a mixture of two or more different monomers react to form a polymer.
an acid that ionises completely, e.g. HCl, HNO3 and H2SO4
ions formed from the halogens, for example Cl-