Name: ____________________
Period: ____ Date: ________________
Electron Configuration Practice Worksheet
Write the electron configurations of the following elements. For the first two, also include the orbital
notation.
1s22s22p63s1
1)
sodium
2)
iron
3)
bromine 1s22s22p63s23p64s23d104p65s1
4)
barium
5)
neptunium
1s22s22p63s23p64s23d6
1s22s22p63s23p64s23d104p5
1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p67s75f5
Write the noble gas configurations of the following elements:
6)
cobalt
[Ar] 4s23d7
7)
silver [Kr] 5s24d9
8)
tellurium
9)
radium
10)
lawrencium
[Kr] 5s24d105p4
[Rn] 6s2
[Rn] 6s24f145d1
Determine what elements are denoted by the following electron configurations:
11) 1s22s22p63s23p4 sulfur
12) 1s22s22p63s23p64s23d104p65s1 rubidium
13) [Kr] 5s24d105p3 antimony
14) [Xe] 6s24f145d6 osmium
15) [Rn] 7s25f11 nobelium
Fill in the table below using all that we have learned in class:
Element Electron Configuration
Noble Gas
#
Lewis Dot
Configuration
Valence
structure
Electrons
K
1s22s22p63s23p64s1
Y
1s22s22p63s23p64s23d104p65s24d1 [Kr] 5s24d1
2
1s22s22p63s23p3
[Ne] 3s23p3
5
1s22s22p2
[He] 2s22p2
4
P
C
[Ar] 4s1
1
Explain the Aufbau Principle. Orbitals of lower energy get filled before those of higher
energy. 1s is filled before 2s.
Which orbitals are filled in immediately after the 3d? 4p
Which orbital is filled in immediately after the 5s? 4d
Define Hund’s Rule. Each orbital of equal energy gets one electron before doubling
up.
Of the following pairs of orbitals, which is higher energy?
3d and 4s
5d and 5f