bridge »
A valence bond, atom or chain of atoms that connects two different parts of a molecule; the atoms so connected being bridgeheads.
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chain reaction »
A nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms.
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mercury »
A silvery-colored metallic chemical element, liquid at room temperature, with atomic number 80 and symbol Hg.
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quantum mechanics »
The branch of physics which studies matter and energy at the level of atoms and other elementary particles, and substitutes probabilistic mechanisms for classical Newtonian ones.
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