test [70 points] Chemistry date: _________

Ch. 3 & 11 atom, molecule, & atomic structure

1. fill-in the below table. [22 points]

symbol

Atomic mass

# protons

# neutrons

# electrons

Charge

141La 3+

 

 

 

 

 

 

20

 

12

 

- 2

 

90

38

 

36

 

 

2. Write the chemical formula of an ionic compound containing: [6 points]

a. aluminum and sulfur

b. fluorine and barium

c. potassium and nitrogen

 

3. Identify the atoms (by their chemical name, not symbol) and the number of such atoms in the following compounds. [8 points]

a. C 6H 12O 6 (glucose, a sugar) contains: ___________________________

b. CH 3(CH 2) 6CH 3 (found in gasoline) contains: ____________________

c. CH 3CH 2OH (drinking alcohol) contains: ________________________

4. short answer questions. [6 points]

a. What is the shape of a s-orbital ?

b. How many orientation(s) in a p-orbital ?

c. What does the term “orbital” mean ?

 

5. What is the electron configuration and orbital diagram of: [18 points]

a. sulfur

b. arsenic

 

6. Which atom, chlorine or iodine, has a larger size ? Explain the reason for your answer. [10 points]