Electron Configuration Practice Worksheet Worksheet With Answer Key Page 2
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1
2Electron Configurations - Solutions
Note: The electron configurations in this worksheet assume that lanthanum (La)
is the first element in the 4f block and that actinium (Ac) is the first element in the
5f block. If your periodic table doesn’t agree with this, your answers for elements
near the f-orbitals may be slightly different.
2
2
6
1
1)
sodium
1s
2s
2p
3s
2
2
6
2
6
2
6
2)
iron
1s
2s
2p
3s
3p
4s
3d
2
2
6
2
6
2
10
5
3)
bromine
1s
2s
2p
3s
3p
4s
3d
4p
2
2
6
2
6
2
10
6
2
10
6
2
4)
barium
1s
2s
2p
3s
3p
4s
3d
4p
5s
4d
5p
6s
2
2
6
2
6
2
10
6
2
10
6
2
14
10
6
2
5
5)
neptunium
1s
2s
2p
3s
3p
4s
3d
4p
5s
4d
5p
6s
4f
5d
6p
7s
5f
2
7
6)
cobalt
[Ar] 4s
3d
2
9
7)
silver
[Kr] 5s
4d
2
10
4
8)
tellurium
[Kr] 5s
4d
5p
2
9)
radium
[Rn] 7s
2
14
1
10)
lawrencium
[Rn] 7s
5f
6d
2
2
6
2
4
11)
1s
2s
2p
3s
3p
sulfur
2
2
6
2
6
2
10
6
1
12)
1s
2s
2p
3s
3p
4s
3d
4p
5s
rubidium
2
10
3
13)
[Kr] 5s
4d
5p
antimony
2
14
6
14)
[Xe] 6s
4f
5d
osmium
2
11
15)
[Rn] 7s
5f
einsteinium
2
2
6
2
6
2
10
5
16)
1s
2s
2p
3s
3p
4s
4d
4p
not valid (take a look at “4d”)
2
2
6
3
5
17)
1s
2s
2p
3s
3d
not valid (3p comes after 3s)
2
8
18)
[Ra] 7s
5f
not valid (radium isn’t a noble gas)
2
10
5
19)
[Kr] 5s
4d
5p
valid
20)
[Xe]
not valid (an element can’t be its own electron configuration)
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