(1) Hydrogen can never be the central atom.
C → less electronegative atom than O → central atom
(2): Calculate the total number of valence electrons present.
Group Valence Electrons
H 5A 1 x 1 e- = 1 e‑
C 4A 1 x 4 e- = 4 e‑
O 6A 2 x 6 e- = 12 e‑
Total = 17 valence e-
How many resonance structures exist for the formate ion, HCO2-?
Express your answer as an integer