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bond a force that holds groups of two or more atoms together and makes them functional as a unit bond energy the energy required to break a bond ionic and covalent bonds two major types of chemical bonds ionic bonds the attraction between a strongly positive ion and a strongly negative one covalent bonds a bond between atoms with electrons are shared by the nuclei ionic bonds compounds are formed by _______ electronegativity the relative ability of an atom in a molecule to attract shared electrons to themselves difference Polarity between bonds depends on the _______ between the electronegativity values of the atoms forming the bond dipole moment The magnitudes of separated charges times the distance between the charges dipole moment Any diatomic molecule that has a polar bond has a __________. crystal lattice the arrangement of ions in an ionic crystal ionice compounds ____________ tend to form small crystals