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the energy level, or shell, of an atom that contains the valence electrons.
an ion that has both a positive and a negative charge on the same group of atoms.
molecular covalent compounds that do not conduct electricity in water.
four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same...
the levels of energy in which electrons move and which have fixed amounts of energy.
a solid that forms as a product of the reaction between two aqueous solutions.