Multiple choice general knowledge science & technology nickel(II) nitrite Ni(NO2)3 Ni2(NO2)2 Ni3(NO2)2 Ni(NO2)2 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Nickel(II) means Ni2+. Nitrite is NO2- with a -1 charge. To balance +2 and -1, you need two nitrite ions: Ni(NO2)2. Ni(NO2)3 would give -3, and the formulas for B and C don't balance charges.