Name______________________
Chem 1151
Quiz 4
Summer 2006
I.
Multiple Choice (5 @ 3 pts). Circle the correct answer.
1.
Which of the following statements about the quantum mechanical atom is false?
A.
B.
C.
D.
E.
2.
Which of the following is an allowed set of quantum numbers for the 4d electron?
Answer
**A
B
C
D
E
3.
4.
No two electrons in an atom can have the same four quantum numbers.
**The location of an electron in an atom can be measured exactly. (This
statement violates the Heisenberg Uncertainty Principle)
All matter has wave and particle properties.
The s-orbital has a spherical shape.
The energy of an electron in the atom depends on its n value.
n
4
4
3
4
5
ℓ
2
3
4
2
4
mℓ
-2
1
-1
3
-2
s
1/2
1/2
-1/2
1/2
1/2
ms
-1/2
1/2
-1/2
1/2
1/2
Which statements are true?
i)
ii)
iii)
iv)
v)
Zeff increases across the Periodic Table.
T
Ground state carbon has three unpaired electrons. F
Se2-, Br - and Kr are isoelectronic. T
Se2- is larger than Kr. T
In multi-electron atoms, 5s has higher energy than 4d.
A.
B.
C.
**D.
E.
iii
ii and iii
i and iv
i, iii, iv
iii and v
F
The correct equations for the first ionization energy and electron affinity are
A.
B.
C.
D.
**E.
K(s)  K+(g) + e- and
K(s) + e-  K+(g) and
K2+(g) + e-  K+(g) and
K(g)  K+(g) + e- and
K(g)  K+(g) + e- and
F(g)  F-(g)
½ F2(g) + e-  F-(g)
F(s)  F(g)
F-(g)  F(g) + eF(g) + e-  F-(g)
1
5.
The atom with the lowest (least negative) electron affinity among the following
choices is
A.
Ca
**B. Cs
C.
Zn
D.
Cl
E.
Al
II.
Problems
1. (12) a.
(20 points)
Show all work for full or partial credit.
Write the electronic configuration for Cu.
Z = 29
[Ar] 4s1 3d10
b.
Write the electronic configuration for Cu+.
28 electrons
[Ar] 3d10
c.
If a copper-containing sample is paramagnetic, does it contain Cu or Cu+?
Why?
The sample contains Cu since Cu has one unpaired electron and is, therefore,
paramagnetic.
d.
The metal (M) ion in an oxide with formula M2O has 18 electrons. What
is the metal?
M is from Group IA and is missing one electron.
So M has a Z = 19. The metal is K.
e.
Write the electronic configuration for Se2-.
f.
If the allowed ms values are +1/2, 0 and -1/2 but all other quantum number
rules stay the same, write the electronic configuration for Be.
36 electrons, [Kr]
Each atomic orbital can have up to 3 electrons. For Z = 4, the electronic
configuration is 1s3 2s1
2. (8) Predict some properties of a yet-to-be-discovered element of Z = 120.
This element is in Group IIA
a.
metal or nonmetal?
b.
formula in compound with oxygen?
MO
c.
high or low ionization energy?
d.
size of atom compared to element right above it M is larger than
Ra.
2