Question: how many valence electrons are in the polyatomic ion co3^ 2?
Answer: The Carbonate (CO2−3 C O 3 2 − ) Ion Carbon has 4 valence electrons, each oxygen has 6 valence electrons, and there are 2 more for the −2 charge. This gives 4 + (3 × 6) + 2 = 24 valence electrons. 5.