Structure of Atoms: Practice                         Name_______________________________

                                                                   Period_____________ Date _____________

 

Symbol

Name

Atomic

Number

Mass

Number

Number

 of protons

Number

of neutrons

Number

of electrons

 

 

 

 

 

 

 

Cobalt-58

 

 

 

 

 

 

 

28

58

 

 

 

 

 

 

 

33

40

 

 

 

 

 

 

 

 

Rhodium-103

 

 

 

 

 

 

 

78

 

 

117

 

 

 

 

118

 

 

50

 

 

 

 

 

84

60

 

 

 

1

 

 

 

 

1. An atom has 11 protons 11electrons and 10 neutrons. What is its

a. atomic number

b. mass number

c.  Name

d. charge

e.  Complete symbol

2. For argon-39, what is its

a.    Number of protons

b.    Number of neutron

c.     Number of electrons

d.    Mass number

e.  atomic number

f.  Complete symbol

3. For  what is the


a.    Number of protons

b.    Number of neutron

c.     Number of electrons

d.    Mass number

e.  atomic number

f.  Name

5. For cobalt-60, what is its

a.    Number of protons

b.    Number of neutron

c.     Number of electrons

d.    Mass number

e.  atomic number

f.  Complete symbol

6. For  what is the


a.    Number of protons

b.    Number of neutron

c.     Number of electrons

d.    Mass number

e.  atomic number

f.  Name

1. What is average atomic mass of Lithium if 7.42% exists as 6Li (6.015 amu) and 92.58% exists as 7Li (7.016 amu)?

 

2. Calculate the average atomic mass of Chlorine if you know that 75.77% exists as Chlorine-35 (34.969 amu) and 24.23% exists as Chlorine-37 (36.966 amu).

 

 

 

3. Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?

 

 

 

4. Use the following information to determine thaverage atomic mass of  Neon

Isotope

Percent Abundance (%)

Mass (a.m.u.)

20Ne

90.92

19.992

21Ne

0.26

20.994

22Ne

8.82

21.991

 

4. Titanium has five common isotopes. Use the information below to average atomic mass of titanium?

Isotope

Percent Abundance (%)

Mass (a.m.u.)

46Ti

7.93

45.9526

47Ti

7.28

46.9518

48Ti

73.94

47.9480

49Ti

5.51

48.9479

50Ti

5.34

49.9448

 

 

 

6. Without doing any math, are there more Bromine-79 atoms or more Bromine-80 atoms on earth? Explain your reasoning. (Hint: look at the periodic table.)