We are being asked to identify the resonance structuresof acetate ion (PO43−). We will have to draw the Lewis Structure of PO43− first.
Step 1: Determine the central atom in this molecule.
• P is less electronegative than O so P is the central atom.
Step 2: Calculate the total number of valence electrons present.
Group Valence Electrons
P 5A 5 valence e‑ x 1
O 6A 6 valence e- x 4
= 29 valence e‑
-3 charge +3 e-
Total = 32 valence v
Step 3: Draw the Lewis Structure for the molecule
• O → prefers to have complete octet (8 e- around them)
How many resonance structures can be drawn for PO43−?
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