This is a 3D model of potassium nitrate that I made out of puff balls and toothpicks. The orange ball represents nitrogen, the blue represents oxygen, the white is potassium, and the purple, sparkly puffs are unshared electron pairs.
There is a double bond between nitrogen and the oxygen farthest to the left.
The nitrogen and oxygen structure is an AX3, triangular planar, molecule, so there is a 120 degree angle between each nitrogen-oxygen bond.
The nitrogen-oxygen-potassium structure is bent (AX2E2), with an angle of 109.5 degrees.
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