Multiple choice Which of the following are isoelectronic species? CN- 2. NO+ 3. O2+ O2- Both 1 and 2 Both 1 and 4 Both 2 and 3 Both 2 and 4 Both 3 and 4 Reveal answer Fill a bubble to check yourself A Correct answer Explanation CN- : (6+7+1) e-= 14 e- NO+ : (7+8-1) e-= 14 e- Both CN- and NO+ have the same number of electrons (isoelectronic species).