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primary particles: electrons, protons and neutrons.
calculating the mass of a substance, given the mass of a reactant or product.
a temporary unstable high energy composition of atoms representing a transition step between the...
a reaction that takes place automatically by itself, without requiring extra stimulation.
a group of organic compounds in which a halogen has replaced a hydrogen atom.
single superphosphate fertiliser (SSP) is manufactured by adding sulfuric acid to phosphate...