This preview shows pages 1–3. Sign up to view the full content.
myers (nmm698) – H04: Atomic Theory 2 – Mccord – (50970)
1
This printout should have 30 questions.
Multiplechoice questions may continue on
the next column or page – fnd all choices
beFore answering.
001
(part 1 oF 3) 10.0 points
What is the principal quantum number For
the orbital 5
f
?
1.
None oF these
2.
6
3.
2
4.
4
5.
3
6.
5
correct
Explanation:
n
= 5
002
(part 2 oF 3) 10.0 points
What is the orbital angular momentum quan
tum number For the orbital 5
f
?
1.
4
2.
2
3.
0
4.
None oF these
5.
1
6.
3
correct
Explanation:
ℓ
= 3
003
(part 3 oF 3) 10.0 points
How many magnetic quantum numbers does
the orbital 5
f
have?
1.
9
2.
7
correct
3.
None oF these
4.
1
5.
3
6.
5
Explanation:
m
ℓ
=

3
,

2
,

1
,
0
,
1
,
2
,
3
004
10.0 points
How many total nodal planes are present in
the complete set oF 3
d
orbitals?
1.
10
2.
8
correct
3.
20
4.
3
5.
5
6.
16
Explanation:
There are 5 orbitals in the 3
d
set.
4 oF
those orbitals are cloverleaFshaped and have
2 nodal planes each. That combines to give 8
total nodal planes For the set. The other (5th)
orbital is the
d
z
2
orbital which has 2 nodal
cones, not planes.
005
10.0 points
How many nodes are present in a 3
s
and a 3
p
orbital, respectively?
1.
0 and 1
2.
2 and 2
correct
3.
1 and 1
4.
0 and 2
5.
2 and 1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document myers (nmm698) – H04: Atomic Theory 2 – Mccord – (50970)
2
Explanation:
A node is a point, a plane or a three dimen
sional region of space where the sign of the
wavefunction changes from positive to nega
tive, (or negative to positive) so it equals zero.
The lowest energy
s
orbital is 1
s
, and this has
no nodes – the wavefunction is always posi
tive. As we go to the next higher value of
n
we add a spherical node, so 2
s
would have one
node, and 3
s
two. The lowest energy
p
or
bital is 2
p
; it has one nodal plane which cuts
through the nucleus (the two ’lobes’ have op
posite signs). Again, as we go to the next
higher value of
n
we add a spherical node, so
a 3
p
orbital has two nodes.
006
10.0 points
The transition metals are elements with par
tially Flled
1.
s
subshells.
2.
d
subshells.
correct
3.
f
subshells.
4.
p
subshells.
Explanation:
In transition metals,
d
orbitals are being
Flled.
007
10.0 points
An element with 20 protons and 20 electrons
gains one electron.
The electron goes into
what type of orbital?
1.
3
d
correct
2.
4
s
3.
3
p
4.
4
p
5.
4
d
6.
3
s
Explanation:
This element has electron conFguration
[Ar] 4
s
2
. The next electron goes into the 3
d
orbital according to the Aufbau principle.
008
10.0 points
Which element is predicted to have the
groundstate
electron
conFguration
[Ne]
3
s
2
3
p
4
?
1.
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 03/10/2011 for the course CHEM 301 taught by Professor Wandelt during the Fall '08 term at University of Texas at Austin.
 Fall '08
 wandelt
 Atom

Click to edit the document details