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| any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals |
| having an unsymmetrical arrangement of atoms in a molecule, or noting a carbon atom bonded to four different atoms or groups |
epimer ep·i·mer (ěp'ə-mər)
n.
One of two molecules that differ only in the spatial arrangement around a single carbon atom.