# Phosphorus Atom

A) 4, 2

B) 2, 4

C) 2, 3

D) 4, 3

E) 0, 3

2-There are __________ paired and __________ unpaired electrons in the Lewis symbol for a phosphorus atom.

A) 4, 2

B) 2, 4

C) 2, 3

D) 4, 3

E) 0, 3

3- How many unpaired electrons are there in an ion?

A) 0

B) 1

C) 2

D) 3

E) This cannot be predicted.

4-What is the electron configuration for the ion?

A)

B)

C)

D)

E)

5- How many single covalent bonds must a silicon atom form to have a complete octet in its valence shell?

A) 3

B) 4

C) 1

D) 2

E) 0

6-What is the maximum number of double bonds that a hydrogen atom can form?

A) 0

B) 1

C) 2

D) 3

E) 4

7-Given the electronegativities below, which covalent single bond is most polar? Element: H C N O

Electronegativity:2.1 2.5 3.0 3.5

A) C-H

B) N-H

C) O-H

D) O-C

E) O-N

8--A nonpolar bond will form between two __________ atoms of __________ electronegativity.

A) different, opposite

B) identical, different

C) different, different

D) similar, different

E) identical, equal

9- The ion has __________ valence electrons.

A) 15

B) 14

C) 16

D) 10

E) 12

10-The Lewis structure of shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs.

A) 2, 2

B) 1, 3

C) 3, 1

D) 1, 2

E) 3, 3

11- The Lewis structure of HCN (H bonded to C) shows that __________ has __________ nonbonding electron pairs.

A) C, 1

B) N, 1

C) H, 1

D) N, 2

E) C, 2

10-The formal charge on carbon in the molecule below is __________.

A) 0

B) +1

C) +2

D) +3

E) -1

11-The formal charge on nitrogen in is __________.

A) -1

B) 0

C) +1

D) +2

E) -2

12-In the Lewis structure of ClF, the formal charge on Cl is __________ and the formal charge on F is __________.

A) -1, -1

B) 0, 0

C) 0, -1

D) +1, -1

E) -1, +1

13- In the resonance form of ozone shown below, the formal charge on the central oxygen atom is __________.

A) 0

B) +1

C) -1

D) +2

E) -2

14- How many equivalent resonance forms can be drawn for - (carbon is the central atom)?

A) 1

B) 2

C) 3

D) 4

E) 0

15-Using the table of bond dissociation energies, the for the following gas-phase reaction is __________ kJ.

A) -44

B) 38

C) 304

D) 2134

E) -38

Please join StudyMode to read the full document