Question

1. How many valence electrons are in the following molecules?

2. What is the number of bonding groups, lone electron pairs, and electron groups around the central atom of the following molecules?

3. What is the electron geometry of the following molecules?,

4. What is the molecular geometry (shape) of the following molecules?

H₂O

SO₂

ClF₃

SF₆

5. If the following atoms are connected by a covalent bond, which atom would be expected to have a fractional (partial) negative charge?

O and H

C and N

Cl and F

Si and P

Answer 1

H₂O:

1) valence electrons are in the following molecules = (6 + 2) = 8

2. number of bonding groups = 2

lone electron pairs = 2

and electron groups around the central atom of the following molecules = 4

3. electron geometry of the following molecules = tetrahedral

4. molecular geometry (shape) of the following molecules = bent

SO₂

1) valence electrons are in the following molecules = 18

2. number of bonding groups = 2

lone electron pairs = 1

and electron groups around the central atom of the following molecules = 3

3. electron geometry of the following molecules = trigonal planar

4. molecular geometry (shape) of the following molecules = bent

ClF₃

1) valence electrons are in the following molecules = 28

2. number of bonding groups = 3

lone electron pairs = 2

and electron groups around the central atom of the following molecules = 5

3. electron geometry of the following molecules = trigonal bipyramidal

4. molecular geometry (shape) of the following molecules = T-shaped

SF₆

1) valence electrons are in the following molecules = 48

2. number of bonding groups = 6

lone electron pairs = 0

and electron groups around the central atom of the following molecules = 6

3. electron geometry of the following molecules = octahedral

4. molecular geometry (shape) of the following molecules = octahedral

5. If the following atoms are connected by a covalent bond, which atom would be expected to have a fractional (partial) negative charge?

O and H: O have a fractional (partial) negative charge

C and N: N have a fractional (partial) negative charge

Cl and F: F have a fractional (partial) negative charge

Si and P: P have a fractional (partial) negative charge