Chem 105 Exam II
Spring 2005
Name: _____________________________________
1) Rank the following from LOWEST frequency to HIGHEST:
microwave, blue visible
light, x-rays, red visible light FM radio waves, gamma rays. (5 pts)
LOWEST ------------------------------------------------------------------------HIGHEST
FM Radio, microwave, red, blue, xray, gamma ray
2) Give a CONDENSED electron configuration for Thallium and determine the number
of valence electrons. (5 pts)
[Xe] 6s
2
4f
14
5d
10
6p
1
Three valence electrons
3) Give a full electron configuration and use a box-type diagram to determine if Rhenium
is diamagnetic or paramagnetic.
State clearly your conclusion. (10 pts)
1s
2
2s
2
2p
6
3s
2
3p
6
4s
2
3d
10
4p
6
5s
2
4d
10
5p
6
6s
2
4f
14
5d
5
__↑__
__↑___
__↑___
__↑___ __↑___
PARAmagnetic
5 d
4) Give a CONDENSED electron configuration for a Mercury (II) ion (5 pts)
[Xe]4f
14
5d
10
5) Predict which has a larger radius: O
-2
or Ba
+2
– justify your answer (5 pts)
Ba
+2
is much bigger due to much larger valence shell
1
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6) For the molecule CH
3
CN, sketch the
σ bonds ONLY
(indicating the type of orbital, s,
p, sp, sp
2
, sp
3
, etc. involved) and give the TOTAL number of σ bonds and the TOTAL
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- Fall '05
- F
- Atom, Electron, Molecule, Chemical bond, correct Lewis structure, Molecular Geometry Trigonal Planar Trigonal Pyramid Linear Tetrahedral Bent
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