We will have to draw the Lewis Structure of HCO2- first.
Step 1: Determine the central atom in this molecule.
• C and H are less electronegative than O but H can only make one bond
• C is the central atom and is bonded to the other C atom
Step 2: Calculate the total number of valence electrons present.
Group Valence Electrons
C 4A 4 valence e‑ x 1
H 1A 1 valence e‑ x 1
O 6A 6 valence e- x 2
= 17 valence e‑
-1 charge +1 e-
Total = 18 valence e-
Step 3: Draw the Lewis Structure for the molecule
• O and C → prefers to have complete octet (8 e- around them)
How many resonance structures exist for the formate ion, HCO2−?
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