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 f. 5 g. 6
the shape at the central atom is 2
h. diatomic i. linear j. trigonal planar k. bent (120°) l. tetrahedral
m. pyramidal n. bent (109.5°) o. see - saw p. hexahedral q. t - shape
r. octahedral s. square pyramidal t. square planar
if all of the bonds are polar covalent, is the molecule itself polar? 3
u. yes v. no

Explanation:

1. By counting the number of red balls (which represent electron - density regions) around the central atom in the model, we can determine the number of REDs.
2. The shape of a molecule is determined by the number of electron - density regions and the number of lone pairs. For 4 electron - density regions (assuming no lone pairs shown in the basic model for shape determination here, as the question is about the general model shape based on the given structure), the shape is tetrahedral.
3. In a tetrahedral molecule with all polar covalent bonds, if the surrounding atoms are the same (as implied by the model with same - type red balls), the dipoles cancel out.

Answer:

1. E. 4
2. L. tetrahedral
3. V. no