In a dilute solution of sulphuric acid, the positive ion is of hydrogen, while the negative ion is the (SO4) or sulphion.
Under the former circumstances it becomes a positive ion, and under the latter a negative ion.
The fixing of the wandering electron to a neutral atom creates a negative ion.
By charging A and C negatively instead of positively we can arrive at the velocity of the negative ion.
Similarly we call the chlorine ion, which has one less proton than it has electrons, a minus or “negative ion.”
1834, introduced by English physicist and chemist Michael Faraday (suggested by the Rev. William Whewell, English polymath), coined from Greek ion, neuter present participle of ienai "go," from PIE root *ei- "to go, to walk" (cf. Greek eimi "I go;" Latin ire "to go," iter "a way;" Old Irish ethaim "I go;" Irish bothar "a road" (from *bou-itro- "cows' way"), Gaulish eimu "we go," Gothic iddja "went," Sanskrit e'ti "goes," imas "we go," ayanam "a going, way;" Avestan ae'iti "goes;" Old Persian aitiy "goes;" Lithuanian eiti "to go;" Old Church Slavonic iti "go;" Bulgarian ida "I go;" Russian idti "to go"). So called because ions move toward the electrode of opposite charge.
ion i·on (ī'ən, ī'ŏn')
An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons.