Honors Chemistry
Name: _______________________________________ Date: _______________ Mods: __________
Chapter Two Review:
Sections 2.1-2.5
1. Match the following scientist with their experiment/contribution to atomic theory:
a. John Dalton
_______1. First to believe there was a piece of matter
b. Ernest Rutherford
which would be indivisible
c. Robert Millikan
_______2. Developed the understanding radioactivity
d. JJ Thompson
_______3. Cathode ray tube experiment
e. Democritus
_______4. Atomic Theory which includes 3 Basic Laws
f.
_______5. Gold Foil Experiment
Marie Curie
_______6. Oil Drop Experiment
________6. Credited with discovering the electron from his experiment results and the charge
to mass ratio of an electron
________7. Ancient Greek philosopher whose idea about matter was lost for over 2000 years
________8. Had evidence that supported a model of the atom which has a small, dense,
positively charged center (nucleus).
________9. Incorrectly believed, and wrote in his theory, that the atom was indivisible
________10. Credited with calculating the charge of a single electron
________11. The first to propose atomic theory based on scientific evidence
________12. Hypothesized that the model of the atom was like “Plum Pudding” in that the
majority of the atom was a sphere of positive charge with small negative particles
spread evenly throughout it (like raisins in pudding). This resulted in an atom that
had an even mass and charge distribution throughout it.
________13. His model of the atom was the first to propose that the electrons were separate
from the positive charge of the atom (electrons outside of the nucleus) and that
the majority of the atom was empty space
________14. Died from radiation poisoning
2.
What is the name of each of the following groups?
a. Group 1A: _________________________________________________________
b. Group 2A: _________________________________________________________
c. Group 6A/16: _________________________________________________________
d. Group 7A/17: _________________________________________________________
e. Group 8A/18: _________________________________________________________
3. Identify the element based on its group/period assignment.
a.
The period 2 alkaline earth metal: _____________________________________
b. The period 5 Noble gas: _____________________________________
c. The period 6 alkaline earth metal: _____________________________________
d. The metalloid in group 16: _____________________________________
e. The only nonmetal in group 14: _____________________________________
4. Use your periodic table to fill in the missing information in the chart below.
Isotope of Element
Atomic
Mass
Atomic
Number
184
74
# protons
35
# neutrons
#
electrons
45
197
118
85
Rb
7
7
Copper-63
87
138
78
5. What is the average atomic mass of Germanium off of the periodic table?
____________________________. Taking this into consideration, which is more abundant,
72
Ge or 73Ge, assuming that these are its only two isotopes? Explain.
6. In nature, 20.3% of Boron exists as Boron-10 and the remainder is Boron-11. What is the
average atomic mass of Boron (assume the isotopic masses are whole numbers)?
7. Nitrogen is made up of two isotopes, N-14 and N-15. The isotopic masses are 14.003074 amu
and 15.000108 amu, respectively. Given nitrogen's average atomic weight is 14.007 amu,
what is the percent abundance of each isotope?