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four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same two atoms.
(also called coordinate bond) one atom contributes both electrons (or a lone pair of electrons)...
the part of the Earth's hydrosphere that is made of frozen water.
a process that takes energy into the system. This increases the internal energy of the system (...
electrostatic forces of attraction that keep cations and anions together in a crystal lattice...