Electron Configuration Worksheet Page 3
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1
2
3Chem 201A
Dr. Baxley
Answers
1
1. H, Li, Na, K, Rb and Cs all have an outer shell with the configuration ns
.
2
4
O, S, Se, Te and Po all have and outer shell with the configuration ns
np
.
2. a. Ga
2+
b. Cd
c. As
2
2
6
2
6
2
6
3. a. Full: 1s
2s
2p
3s
3p
4s
3d
2
6
Abbreviated: [Ar] 4s
3d
paramagnetic
2
2
6
2
6
2
10
6
1
5
b. Full: 1s
2s
2p
3s
3p
4s
3d
4p
5s
4d
1
5
Abbreviated: [Kr] 5s
4d
Paramagnetic
2
2
6
2
6
2
10
6
2
10
6
1
14
10
c. Full: 1s
2s
2p
3s
3p
4s
3d
4p
5s
4d
5p
6s
4f
5d
1
14
10
Abbreviated: [Xe] 6s
4f
5d
Paramagnetic
2
6
4. a. 24 inner, 2 outer, 8 valence (4s
3d
)
1
5
b. 41 inner, 1 outer, 6 valence (5s
4d
)
1
10
c. 78 inner, 1 outer, 11 valence (6s
5d
)
5. a.
4s
3d
4p
Ge is paramagnetic
b.
4s
Ca is diamagnetic
6. increasing effective nuclear charge: K<Li<C<O<F
decreasing atomic radii (size): K>Li>C>O>F
increasing 1st Ionization Energy: K<Li<C<O<F
increasing electron affinity: K<Li<C<O<F
decreasing metallic behavior: K>Li>C>O>F
2–
2–
7. a. S
is larger than S because they have the same number of protons, but S
has two more
electrons. The electrons will repel each other, causing the ion to be larger.
2+
2+
b. Sr is larger than Sr
because when Sr loses two electrons to become Sr
the remaining
electrons are held more tightly by the nucleus
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