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reactions in which an atom or group of atoms is replaced in a molecule by another atom or group of atoms.
a temporary unstable high energy composition of atoms representing a transition step between the...
large deposits formed from the excrement and bodies of seabirds. Often found on islands.
atoms of the same element that contain equal numbers of protons (same atomic number) but...
the temperature at which a substance changes phase from a solid to a liquid at a specific or...