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.
What is nuclear science? Nuclear science is the study of the atomic world. In nuclear science, the word 'nuclear' means 'of or relating to or constituting the nucleus of an atom'. Atoms are the fundamental constituents of everything around us, and we ourselves are entirely composed of them. Nuclear science is crucial to understanding our universe, our world and ourselves at the atomic level. If we can understand how atoms get together, interact, or can be best combined with other atoms, new, more efficient materials and drugs can be developed. ANSTO and nuclear science