Physical Science Institute
Summer 2013
Atomic Structure
Self-Assessment
____1. Which of the following is included in the quantum mechanical model, but not in the Bohr model of the atom?
I. Atoms are made of smaller positive and negative charged particles.
II. Wave properties of electrons.
III. Electrons in the atom have specific energies (quanta).
IV. Most of the atom is empty space.
A. I only
B. II only
C. I & IV
D. I & II
E. III & IV
____2. The statement in Dalton's Atomic Theory that, "All atoms of the same element are exactly alike", has been
replaced in the modern atomic theory because of the discovery of:
A. Isotopes
B. Cathode rays
C. X-rays
D. Quantum tunneling
____3. One of the naturally occurring isotopes of rubidium is
A. 37 protons and 50 neutrons
B. 87 protons and 37 neutrons
C. 37 protons and 87 neutrons
D. 87 protons and 50 neutrons
87
37𝑅𝑏
. The nucleus of this isotope contains:
____4. Which of the following statements about a zinc (Zn) atom is correct?
A. Zinc atoms have 35 neutrons in the nucleus.
B. Zinc atoms exist naturally as different isotopes.
C. Zinc atoms have 30 neutrons in the nucleus.
D. Zinc atoms have 65.4 neutrons in the nucleus
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____5. The nucleus of 212
84𝑃𝑜 undergoes alpha decay ( 2𝐻𝑒 )to produce:
A. Rn-216
B. Pb-208
C. At-212
D. Bi-210
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Physical Science Institute
Summer 2013
6. Four beral pipets assemblies contain the chlorides of the following metal ions:
Ca+2, Cu+2, Mn+2, Zn+2
The pipets containing the salts listed above are suspended and arranged as shown in the diagram below:
+2
+2
Cu
Mn
+2
Zn
Ca
+2
A strong neodymium magnet is brought near each sample to see how these salts react. The results are shown below:
Cu+2 : attracted to the magnet (paramagnetic)
Mn+2: attracted to the magnet (paramagnetic)
Zn+2: not affected or slightly repelled by the magnet (diamagnetic)
Ca+2: not affected or slightly repelled by the magnet (diamagnetic)
Explain why each metal ion reacted to the magnet using the quantum mechanical model.
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