Name_________________________
Test Review - Atomic Theory
Due Date____________ Score_______/_____
Describe each person’s main contribution to the development of the atomic model.
1. Democritus - _____________________________________________________________________________________
2. Dalton - _________________________________________________________________________________________
__________________________________________________________________________________________________
3. Thompson - ______________________________________________________________________________________
__________________________________________________________________________________________________
4. Rutherford - _____________________________________________________________________________________
_________________________________________________________________________________________________
5. Bohr - __________________________________________________________________________________________
__________________________________________________________________________________________________
6. Name and describe the current atomic model - _________________________________________________________
__________________________________________________________________________________________________
__________________________________________________________________________________________________
7-8 Complete the following chart of subatomic particles: (p. 76)
Particle
electron
Symbol
Electric Charge
Mass #
Relative mass (amu)
p+
Location in atom
1.007276
0
9. What are isotopes?________________________________________________________________________________
10. What is the atomic number of an element?____________________________________________________________
11. What is the mass number of an isotope?______________________________________________________________
12. In the nuclear symbol
65
29
Cu identify the atomic # - _____________ and the mass #___________
13. Given the following information, write each isotope in hyphen notation.
a. atomic # = 2, mass # = 4
_______________
(ex: Cesium-133)
b. atomic # = 19, mass # = 39
________________
14. a. What is the definition of a mole?__________________________________________________________________
b. What is the abbreviation for mole?_____________
c. How many particles are in one mole?______________
d. What name is given to the number of particles in a mole? ____________________________
15. a. What is the molar mass of an element?_____________________________________________________________
b. To two decimal places, write the molar masses (with units):
CH2CH2 - ______________
neon - _______________ iron - _______________ Uranium - ______________
16. What is the mass in grams of each of the following:
a. 1.00 mol Li ______________
b. 1.00 molar mass Ca ______________ c. 6.022 x 10 23 atoms of Ag ____________
17. How many moles of atoms are there in each of the following:
a. 6.022 x 1023 atoms of Ne _________________
b. 3.25 x 105 g of Pb ___________________
18. Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and
abundances of each of the isotopes.
Ar-36 (35.97 amu; 0.337%) Ar-38 (37.96 amu; 0.063%) Ar-40 (39.96% amu; 99.600%)
19. Determine the mass in grams of each of the following: Show your work! CIRCLE YOUR ANSWER!
a. 3.00 mol Al
b. 4.86 x 1024 molecules of CH4
20. How many atoms are in each of the following: Show all work! CIRCLE YOUR ANSWER!
a. 5.5 mol of H2O
b. 3.4 g of Nitrogen
Fill in the chart with the missing information.
21-23.
Isotope
Si-28
Si-29
Si-30
# of protons
24. Which atom has more neutrons, potassium-40
# of electrons
# of neutrons
or argon-40?___________________________
25. Write the nuclear symbol of an atom containing 69 neutrons and 50 protons. (refer to notes.)
HONORS Supplement:
26. Organizing Ideas Using two chemical compounds as an example, describe the difference between the law of
definite proportions and the law of multiple proportions.
(EXPLAIN your answer in complete sentence form.)
27. Extended Response A student believed that she had discovered a new element and named it mythium. Analysis
found it contained two isotopes. The composition of the isotopes was 19.9% at atomic mass 10.013 and 80.1% of
atomic mass 11.009. What is the average atomic mass, and do you think mythium was a new element?
(Show work and EXPLAIN your answer in complete sentence form.)