NAME:
CHE 121 SUMMER QUARTER 2008
QUIZ 3
This quiz is worth 15 marks the value for each question is as indicated. You have 25
minutes to complete the quiz. Do not open this paper until instructed. You may use
dictionaries, calculators and any data sheets provided by the instructor. Use only the
scratch paper provided by the instructor. Please write your name in pen clearly at the
top of this page. No other materials are to be used. Mobile phones are to be turned off
and placed out of sight. Everything other than this test paper and the materials
described above should be placed inside your bag. Students who cheat will receive
zero for this quiz. Students who cheat more than once will be dropped from the
course. Allowing someone to copy your work is considered cheating. Once you have
completed the quiz remain quietly seated until the instructor collects your paper.
Please be respectful to other students who may still be working. Once instructed to
stop writing close your quiz and cease writing immediately. Attempting this quiz is an
acknowledgement you have read, understood and agreed to abide by the rules
outlined above.
In order to obtain full credit you must show all working and give answers to the
correct number of significant figures and give the appropriate units.
Constants:
NA = 6.022 x 1023 particles per mole
1. The highest-energy shell of an element that is called what?
(1 mark)
The valence shell
2. The radius of a K atom is _____ a Ca atom.
a. smaller than
b. larger than
c. equal to
d. inverted from
(1 mark)
3. Would you expect the melting point of oxygen to be higher or lower than
selenium?
(1 mark)
Lower
4. State the Pauli exclusion principle
(1 mark)
Only electrons spinning in opposite directions can occupy the same
orbital
5. Write the abbreviated electronic configurations for the following elements.
a) an element that contains 22 electrons
b) element number 23
c) bromine
d) iron
a) [Ar]4s23d2
b) [Ar]4s23d3
c) [Ar]4s23d104p5
d) [Ar]4s23d6
(2 marks)
6. Write the symbol and name for the element that.
a) Contains one 2p electron
b) Contains a half-filled 3s subshell
(2 marks)
a) B, boron
b) Na, sodium
7. How many unpaired p electrons are found in sulfur?
(1 mark)
2 unpaired electrons
8. What period 2 element would be expected to have chemical properties
most like silicon?
(1 mark)
Carbon
9. How many valence electrons does silicon have?
(1 mark)
4
10. Classify each of the following elements as belonging to either the s, p, d,
or f block of the periodic table.
a) Cl p
b) Zn d
c) element 62 f
d) Sr s
(2 marks)
11. Classify the following as metals, nonmetals, or metalloids.
a) rubidium metal
b) arsenic metalloid
c) element number 50 metal
d) S nonmetal
e) Br nonmetal
(2 marks)
12. State Hund’s rule
(1 mark)
Electrons will not join other electrons in an orbital if an empty orbital of
the same energy is available for occupancy.