Objective Sheet
Be very specific!!!
a. Democritus
b. Aristotle
c. John Dalton
d. J.J. Thomson
e. Robert Milikan
f. Goldstein
g. James Chadwick
h. Henri Becquerel
i. Marie and Pierre Curie
j. Ernest Rutherford
2. Define the following words:
a. atom
b. atomic mass
c. atomic mass unit
d. atmoic number
e. canal rays
f. cathode rays
g. electron
h. isotope
i. mass number
j. neutron
k. nucleus
l. proton
m. radioactivity
3. What does "atomos" literally mean?
4. What objects did Aristotle use to describe earth, wind, fire, and water? Why did he choose
such objects?
5. List the four points to John Dalton's atomic theory.
6. Draw and label the parts of the cathode ray tube. Be sure to include the
a. cathode
b. anode
c. cathode rays
d. canal rays
7. Draw and list the key differences between the different models of the atom.
a. J.J. Thomson's Plum Pudding Model
b. Rutherford's Planetary Model
8. What conclusions did Ernest Rutherford draw about the atom from his Gold Foil experiment?
a. charge of nucleus
b. density of nucleus
c. size of nucleus
d. items in nucleus
e. items outside nucleus
f. charge of region outside nucleus
9. Read the periodic table to determine
a. the atomic number
b. the number of protons
c. the number of electrons in a neutral atom
d. the mass number of the most common isotope of an atom
e. the number of neutrons for the most common isotope of an atom
f. the atomic mass
10. Calculate the number of protons, electrons, neutrons, atomic number and mass number for
an atom written in mass number and super/sub script form.
11. Write the names of elements in mass number and super/sub script form.
12. The masses on the periodic table are based on the isotope of which element? Which isotope?
13. Explain why the masses on teh periodic table are not in whole numbers.
14. Explain why amu's are used instead of grams to express the masses of the atoms.
15. Calculate the average atomic mass of an element given the number of isotopes and their
percent abundance.
16. Explain how the atomic number identifies an element.
17. Explain how isotopes of an element are similar and different.
18. Memorize the names and symbols for elements 76 - 103.