perlick (app582) – HW02 – quy – (50970)
1
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001(part1of3)10.0points
What is the principal quantum number for
the orbital 3
d
?
1.
5
2.
2
3.
None of these
4.
6
5.
4
6.
3
correct
Explanation:
n
= 3
002(part2of3)10.0points
What is the orbital angular momentum quan-
tum number for the orbital 3
d
?
1.
3
2.
1
3.
0
4.
2
correct
5.
4
6.
None of these
Explanation:
ℓ
= 2
003(part3of3)10.0points
How many magnetic quantum numbers does
the orbital 3
d
have?
1.
5
correct
2.
7
3.
None of these
4.
3
5.
9
6.
1
Explanation:
m
ℓ
=
-
2
,
-
1
,
0
,
1
,
2
004
10.0points
How many total nodal planes are present in
the complete set of 3
d
orbitals?
1.
10
2.
3
3.
16
4.
20
5.
8
correct
6.
5
Explanation:
There are 5 orbitals in the 3
d
set.
4 of
those orbitals are cloverleaf-shaped 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
10.0points
How many nodes are present in a 3
s
and a 3
p
orbital, respectively?
1.
2 and 1
2.
2 and 2
correct
3.
1 and 1
4.
0 and 2
5.
0 and 1
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perlick (app582) – HW02 – quy – (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
10.0points
The transition metals are elements with par-
tially filled
1.
f
subshells.
2.
p
subshells.
3.
d
subshells.
correct
4.
s
subshells.
Explanation:
In transition metals,
d
orbitals are being
filled.
007
10.0points
An element with 20 protons and 20 electrons
gains one electron.
The electron goes into
what type of orbital?
1.
3
p
2.
3
s
3.
4
s
4.
4
d
5.
4
p
6.
3
d
correct
Explanation:
This
element
has
electron
configuration
[Ar] 4
s
2
.
The next electron goes into the 3
d
orbital according to the Aufbau principle.
008
10.0points
Which
element
is
predicted
to
have
the
ground-state
electron
configuration
[Xe]
4
f
14
5
d
5
6
s
2
?
1.
irdium
2.
cesium
3.
hafnium
4.
lutetium
5.
tungsten
6.
tantalum
7.
barium
8.
xenon
9.
rhenium
correct
10.
osmium
Explanation:
Remembering
the
noble
gas
shorthand,
count all of the superscripts that appear in
the electron configuration. This will give the
number of electrons which in a neutral atom
is equal to the number of protons (atomic
number of the element).
Note some excep-
tions do occur in the electron configuration of
atoms because of the stability of either a full
or half-full outermost
d
-orbital; sometimes an
electron is ‘shuffled’ from the (
n
-
1)
s
orbital.

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- Fall '07
- Fakhreddine/Lyon
- Atom, Electron, Energy, Atomic orbital
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