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 (bonds and lone pairs) around the central atom. In the model, there are 4 regions (3 bonds and 1 lone pair).

Step2: Determine molecular shape

For 4 electron - density regions (3 bonding and 1 non - bonding), the molecular shape is pyramidal.

Step3: Check molecular polarity

If all bonds are polar covalent and the molecule has an asymmetrical shape (pyramidal), the dipoles do not cancel out, so the molecule is polar.

Answer:

1. E. 4
2. K. pyramidal
3. M. yes