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COPPIN STATE COLLEGE
DEPARTMENT OF NATURAL SCIENCES
Name _____________________________________ID#_____________
Last
First
Chemistry 103-101 Examination II Chapter 2 – The Composition and Structure of the Atom.
March, 2004. Time 60 minutes.
Dr. Alfred N. Amah
This examination consists of 38 multiple choice questions with five possible responses. Read
each question carefully and choose the best response. There is only one correct response for
each question. You are to answer all questions in this examination.
1. What method is used to determine the exact masses of isotopes and relative
abundances?
a)
b)
c)
d)
e)
density measurement
filtration
electron microscopy
scanning tunneling microscopy
mass spectrometry
2. Which of the following atoms contains the largest number of protons?
a) 128Te
b) 121Sb
c) 127I
d) 107Ag
e) 112Cd
3. How many protons, neutrons, and electrons are in a carbon-13 atom?
a)
b)
c)
d)
e)
6 protons, 6 neutrons, 1 electron
6 protons, 7 neutrons, 6 electrons
7 protons, 6 neutrons, 6 electrons
7 protons, 6 neutrons, 7 electrons
13 protons, 13 neutrons, 13 electrons
4. Copper has two naturally occurring isotopes. A typical sample consists of 69.17% of Cu63 (62.939598 amu) and 30.83% Cu-65 (64.927793 amu). Calculate the atomic mass of
copper.
62.93 amu
62.33 amu
62.45 amu
63.55 amu
e) 63.93 amu
a)
b)
c)
d)
5. What kind(s) of particles can be found in the nucleus of an atom?
a) protons
b) neutrons
c) electrons
d) protons and electrons
e) protons and neutrons
6. Which isotope of hydrogen has two neutrons?
a) hydrogen-1
b) hydrogen-2
c) hydrogen-3
d) deuterium
e) H2
7. The total mass of the protons in any neutral atom is about____ time the total mass of
electrons in the atom.
a)
b)
c)
d)
e)
0.0005
0.3
1
2
2000
8. What is the quantity represented by the mass number minus the atomic number?
a)
b)
c)
d)
e)
number of atoms
number of neutrons
number of electrons
number of protons
number of particles in the nucleus.
9. If an atom gains one electron, it becomes:
a)
b)
c)
d)
e)
10.
a cation
an anion
a positron
a neutral atom
non of the above