baum (awb464) – H04: Atomic Theory 2 – Mccord – (50970)
1
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001
(part 1 of 3) 10.0 points
What is the principal quantum number for
the orbital 3
d
?
1.
2
2.
3
correct
3.
None of these
4.
4
5.
5
6.
6
Explanation:
n
= 3
002
(part 2 of 3) 10.0 points
What is the orbital angular momentum quan
tum number for the orbital 3
d
?
1.
None of these
2.
2
correct
3.
3
4.
4
5.
1
6.
0
Explanation:
ℓ
= 2
003
(part 3 of 3) 10.0 points
How many magnetic quantum numbers does
the orbital 3
d
have?
1.
7
2.
None of these
3.
9
4.
1
5.
3
6.
5
correct
Explanation:
m
ℓ
=

2
,

1
,
0
,
1
,
2
004
10.0 points
How many total nodal planes are present in
the complete set of 3
d
orbitals?
1.
3
2.
10
3.
20
4.
8
correct
5.
16
6.
5
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.
1 and 1
2.
2 and 2
correct
3.
2 and 1
4.
0 and 1
5.
0 and 2
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baum (awb464) – 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 filled
1.
p
subshells.
2.
d
subshells.
correct
3.
s
subshells.
4.
f
subshells.
Explanation:
In transition metals,
d
orbitals are being
filled.
007
10.0 points
An element with 20 protons and 20 electrons
gains one electron.
The electron goes into
what type of orbital?
1.
4
s
2.
3
s
3.
3
d
correct
4.
3
p
5.
4
d
6.
4
p
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
10.0 points
Which
element
is
predicted
to
have
the
groundstate
electron
configuration
[He]
2
s
2
2
p
2
?
1.
hydrogen
2.
helium
3.
lithium
4.
nitrogen
5.
beryllium
6.
carbon
correct
7.
neon
8.
boron
9.
oxygen
10.
fluorine
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
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 Fall '10
 Dr.McCord
 Atom, Periodic Table, Atomic orbital, n+ n+ n+

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