Question

question 1 (2 points)
a region of electron density, or red, refers to an area on a central atom containing electrons. a red is a cloud of electrons. a red could be a nonbonding electron pair (also known as a lone pair), or a bonding electron pair. a bonding electron pair is usually a single covalent bond. a red can also be a double bond, or a triple bond.
in other words, double and triple bonds are treated as single reds.
the lewis structure for the chloride ion has 1 dots and a charge of -1.
the number of reds is 2, the shape is 3, and the bond angles are 4°.
a. 0 b. 1 c. 2 d. 3 e. 4 f. 5 g. 6 h. 7 i. 8
j. no shape, atoms or ions k. diatomic l. linear m. trigonal planar
n. bent o. tetrahedral p. pyramidal q. 109.5 r. 120
s. 180 t. no bond angles, no central atom

Explanation:

• Chloride ion (\(Cl^-\)) has 8 valence electrons (7 from \(Cl\) and 1 extra due to - 1 charge). In Lewis structure, these are represented as dots.
• Chloride ion (\(Cl^-\)) is a single - ion, not a molecule with a central atom. So, the number of REDs is not applicable in the context of molecular geometry (as there is no central atom to have regions of electron density around it).
• Since it is an ion (not a molecule with a central atom having bonded atoms), it has no shape in the context of VSEPR - based molecular shapes.
• Also, because there is no central atom with bonded atoms, there are no bond angles.

Answer:

1. I. 8
2. J. no shape, atoms or ions
3. J. no shape, atoms or ions
4. T. no bond angles, no central atom