MDCAT Chemistry MCQ #1762

In the carbonate ion (CO3^2-), multiple resonance structures can be drawn. What is the total number of valence electrons used in its Lewis structure?

MDCAT Chemistry MCQ #1762

  1. Question 1

    Q1. In the carbonate ion (CO3^2-), multiple resonance structures can be drawn. What is the total number of valence electrons used in its Lewis structure?

    • A) 20
    • B) 22
    • C) 24
    • D) 26

    Answer: 24

    Explanation: Carbon (4) + 3 Oxygens (18) + Charge (2) = 24 valence electrons. 22 fails to account for the -2 charge of the ion.