Ch. 3 & 4 atom, ion, chemical formula / name                                               40 points (1 ec)                                    chemistry

1. Fill-in the below table.  [15 points]

symbol

# protons

# neutrons

# electrons

charge

Mass #

140La +3

 

 

 

 

 

 

33

 

 

- 3

76

 

 

 

54

+ 2

140

2. Identify the number of each atom and its name (not symbol) in one molecule of the below chemicals. [10 points]

a. Sr3(PO4)2 has  _____________________________________________________________  

b. NiS  has  ___________________________________________________________________ 

3. Fill-in the below table.  [16 points]

Chemical name

Chemical formula

Iron (III) oxide

 

Magnesium nitrate

 

 

Pb(OH)2

 

P3Br6

Dinitrogen pentachloride