Electron Configuration Practice Worksheet
In the space below, write the unabbreviated electron configurations of the following elements:
1)sodium ________________________________________________
2) iron ________________________________________________
3) bromine ________________________________________________
4) barium ________________________________________________
5) neptunium ________________________________________________
In the space below, write the abbreviated electron configurations of the following elements:
6) cobalt ________________________________________________
7) silver ________________________________________________
8) tellurium ________________________________________________
9) radium ________________________________________________
10) lawrencium ________________________________________________
Determine what elements are denoted by the following electron configurations:
1s22s22p63s23p4 ____________________
1s22s22p63s23p64s23d104p65s1 ____________________
[Kr] 5s24d105p3 ____________________
[Xe] 6s24f145d6 ____________________
[Rn] 7s25f11 ____________________
Determine which of the following electron configurations are not valid:
1s22s22p63s23p64s24d104p5 ____________________
1s22s22p63s33d5 ____________________
[Ra] 7s25f8 ____________________
[Kr] 5s24d105p5
____________________[Xe] ____________________
Electron
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.
1)
sodium 1s22s22p63s1
2)
iron
1s22s22p63s23p64s23d6
3)
bromine 1s22s22p63s23p64s23d104p5
4)
barium
1s22s22p63s23p64s23d104p65s24d105p66s2
5)
neptunium 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p67s25f5
6)
cobalt
[Ar]
4s23d7
7)
silver
[Kr]
5s24d9
8)
tellurium [Kr]
5s24d105p4
9)
radium
[Rn]
7s2
10)
lawrencium [Rn]
7s25f146d1
11)
1s22s22p63s23p4
sulfur
12)
1s22s22p63s23p64s23d104p65s1
rubidium
13)
[Kr] 5s24d105p3
antimony
14)
[Xe] 6s24f145d6
osmium
15)
[Rn]
7s25f11 einsteinium
16)
1s22s22p63s23p64s24d104p5
not valid (take a
look at “4d”)
17)
1s22s22p63s33d5
not valid
(3p comes after 3s)
18)
[Ra] 7s25f8
not valid
(radium isn’t a noble gas)
19)
[Kr]
5s24d105p5 valid
20)
[Xe] not
valid (an element can’t be its own electron configuration)