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. For the number of REDs:

• By observing the model, we can count the number of regions (represented by the connections to the central atom). There are 4 regions of electron density.

1. For the shape at the central atom:

• When there are 4 regions of electron density around a central atom and no lone - pairs (assuming the model shows all bonds as in a typical tetrahedral case, like in \(CH_4\) where \(4\) bond pairs and no lone pairs), the shape is tetrahedral.

1. For molecular polarity when all bonds are polar covalent:

• In a tetrahedral shape (e.g., if we consider a tetrahedral molecule like \(CH_4\) with all \(C - H\) bonds being polar, but in a symmetrical tetrahedral arrangement, the bond dipoles cancel out. So the molecule is non - polar.

Answer:

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