Consider the following molecules with trigonal planar geometry. Carbonate (CO32− C O 3 2 − ) and nitrate (NO3− N O 3 − ) both exhibit resonance, whereas phosgene (COCl2 C O C l 2 ) does not. Given the information in the transition, and ignoring the simulation, predict the bond angles for each of the molecules in accordance to whether or not they exhibit resonance.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6