Gratias Ago Vos. Gratias Ago Vos. On the new statue (well, not more than a few months old) in the pond in Wizard City Commons, the inscription on the statue reads Gratias Ago Vos. By correct Latin grammar it should be Gratias Ago Vobis. Just saying.
Noun. 1. anion-a negatively charged ion. ion-a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons. hydroxide ion, hydroxyl ion-the anion OH having one oxygen and one hydrogen atom.
A counterion (pronounced as two words, i.e. counter ion, and sometimes written as two words) is the ion that accompanies an ionic species in order to maintain electric neutrality. In table salt (NaCl), the sodium cation is the counterion for the chlorine anion and vice versa. In a charged transition metal complex, a (i.e. non-coordinated) ion accompanying the complex is termed the counterion. In the older literature, the term gegenion (from gegen which means counter in German) is sometimes used.