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atoms of the same element that contain equal numbers of protons (same atomic number) but different numbers of neutrons in their nuclei.
the phase of matter in which the particles have enough free space to move about, but still...
organisms that use dead organic material as a food source and thus recycles them.
the energy released when a nucleus is formed from its component particles.
the elimination of a hydrogen halide, such as hydrogen bromide, from a halo-alkane.