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 (120⁰) l. tetrahedral
m. pyramidal n. bent (109.5⁰) 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. Counting REDs:

• By observing the model, we can count the number of regions (bonds and lone pairs) around the central atom. Each connection (bond or lone pair) is a region of electron density. In the given model, there are 4 regions.

1. Determining Molecular Shape:

• When there are 4 regions of electron density around a central atom and no lone pairs (assuming the model shows 4 bonding regions), the shape is tetrahedral.

1. Polarity of the Molecule:

• In a tetrahedral molecule with all polar covalent bonds of the same type (same atoms attached to the central atom), the bond dipoles cancel out. For example, in \(CH_4\) (a tetrahedral molecule with 4 \(C - H\) polar bonds), the symmetry of the tetrahedral shape leads to a non - polar molecule.

Answer:

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