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.
When atomic radius decreases, electrons are closer to the nucleus, which means that the attraction that atom has on the orbiting electrons increases, and therefore the electronegativity increases. Electronegativity is the ability of an element to attract electrons towards itself when it's bonded.