Negative Ions are missing an electron
Your theory would be more convincing if you had your information correct. Negative ions have a negative charge because they have lost an electron. If there was an extra electron as stated in your article it would then be a cation or positive ion.
Reply: Close but no cigar!
Cations (positive ions) are called cations because they are attracted to the (negative) cathode when in electrolytic solution. They are attracted there because they, themselves are positively charged as a consequence of missing electrons.
Anions, on the other hand are attracted to the (positive) anode because they (being negative ions) can donate electrons to the anode, which sucks them up!
Thansk for the question though, which hopefully clears up any confusion ;-)