Covalent bonding . One rule for predicting when an ionic bond will take place is when the difference between electronegativities is 1.7 or greater. In other cases atoms bond by sharing electrons on the valence shells. The force that holds two atoms together in this case is called a covalent bond. A covalent bond can be described as the mutual attraction that positive nuclei have for the shared, negatively charged bonding electrons.
nuclear. adj. 1. (General Physics) of, concerned with, or involving the nucleus of an atom: nuclear fission. 2. (Biology) biology of, relating to, or contained within the nucleus of a cell: a nuclear membrane. 3. of, relating to, forming, or resembling any other kind of nucleus. 4. (General Physics) of, concerned with, or operated by energy from fission or fusion of atomic nuclei: a nuclear weapon.
nuclear energy. noun. 1  The energy released by a nuclear reaction, especially by fission or fusion. 2  Nuclear energy regarded as a source of power. 3  Also called atomic energy. plant for the production of atomic or nuclear energy. A plant for the production of atomic or nuclear energy. Nuclear energy is a source of power which is created from energy released by a nuclear reaction.