Question

question 7 (1 point) which of the following molecules demonstrates a trigonal planar molecular shape? sf₃ bf₃ no₃ h₃o⁺

Explanation:

Step1: Analyze SF₃

SF₃ has a central sulfur atom with lone - pairs and bonding pairs. The presence of lone - pairs distorts the shape and it does not have a trigonal planar shape.

Step2: Analyze BF₃

The central boron atom in BF₃ has 3 bonding pairs and no lone - pairs. According to VSEPR (Valence - Shell Electron - Pair Repulsion) theory, it has a trigonal planar molecular shape.

Step3: Analyze NO₃⁻

The central nitrogen atom in NO₃⁻ has 3 bonding pairs and no lone - pairs on the central atom. It has a trigonal planar shape.

Step4: Analyze H₃O⁺

The central oxygen atom in H₃O⁺ has 3 bonding pairs and 1 lone - pair. The lone - pair causes distortion and it has a trigonal pyramidal shape.

Answer:

B. BF₃, C. NO₃⁻