my definition of bonding is the share of electrons between two atoms that releases energy upon formation and invests potential energy and is determined by the atomic radii and protons of these two atoms.
purely ionic "bonding" doesn't exist.
in a water molecule, 118.0 + or - 0.2 is the DOO measurement. this is actually a considerable amount of energy comparatively speaking. the covalent radius of O-2 is 1.40, of O- it is 1.76, of O+ it is 0.22, of H- it is 2.08, and of H+ it is 10^-5