The mechanism of action of probiotics (e.g., having an impact on the intestinal microbiota or enhancing immune function) was dropped from the definition to encompass health effects due to novel mechanisms and to allow application of the term before the mechanism is confirmed.
Noun. 1. electronegativity - (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond. negativity.
One way to estimate the degree of ionic or covalent character in a chemical bond is to compare electronegativities of atoms involved. Electronegativity is a measure of the force of an atomâs attraction for electrons that it shares in a chemical bond with other atoms.olar covalent bonds are those in which the bonding pair of electrons is unequally shared (0.5 ((EN (1.7). Examples include HBr, HCl, etc. In polar covalent compounds, the more electronegative atom has a partial negative charge ((-) and the less electronegative atom has a partial positive charge ((+).