Name ____________________
CHEM 1004
Homework #5
Spring 2011
Buckley
This homework is due on Thursday, February 10, at class time. The assignment will be accepted
up until the start of class on Monday, February 14, with a 20% penalty. Assignments turned in
after class that day will receive no credit, though I will look through them if you want me to.
1. (7 points) Match each of the following names with the discovery most attributed to that
individual.
______ Michael Faraday
A. The atom consisted of a tiny nucleus
with most of the mass and the positive
particles.
______ Robert Millikan
B. Determined positive charges were also
produced in a cathode ray tube
______ J.J. Thomson
C. Exploration of the interaction of
electricity with matter
______ Eugen Goldstein
D. Constructed the first cathode ray tube
______ William Crookes
E. Discovered and named electrons
______ Ernest Rutherford
F.
Recognized as the individual most
responsible for the current form of the
periodic table
______ Dmitri Mendeleev
G. Determined the mass to charge ratio of
an electron.
2. (16 points) Complete the missing information in the following table.
Isotopic Symbol
35
17
Cl
131 
53
I
33
15
137
56
P
Ba 2 
# protons
# neutrons
#electrons
Mass number