Question

answer the questions about the following model
there are 1 reds (regions of electron density) around the central atom
a. 0 b. 1 c. 2. d. 3 e. 4
the shape at the central atom is 2
f. diatomic g. linear h. trigonal planar
i. bent (120°) j. tetrahedral k. pyramidal l. bent (109.5°)
if all of the bonds are polar covalent, is the molecule itself polar? 3
m. yes n. no

Explanation:

Step1: Count REDs

Count the number of electron - density regions around the central atom. From the model, there are 3 regions.

Step2: Determine molecular shape

For 3 regions of electron density, if there is one lone pair (assuming the model has a central atom with 3 electron - density regions, one of which is a lone pair), the molecular shape is bent with a \(120^{\circ}\) angle.

Step3: Check polarity

If all bonds are polar covalent and the molecule is bent (\(120^{\circ}\)), the bond dipoles do not cancel out. So the molecule is polar.

Answer:

1. D. 3
2. I. bent (\(120^{\circ}\))
3. M. yes